CN103128437A - Stirring friction welding device avoiding forming root defects and welding method - Google Patents
Stirring friction welding device avoiding forming root defects and welding method Download PDFInfo
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- CN103128437A CN103128437A CN2013100874928A CN201310087492A CN103128437A CN 103128437 A CN103128437 A CN 103128437A CN 2013100874928 A CN2013100874928 A CN 2013100874928A CN 201310087492 A CN201310087492 A CN 201310087492A CN 103128437 A CN103128437 A CN 103128437A
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Abstract
The invention provides a stirring friction welding device avoiding forming root defects and a welding method and relates to the stirring friction welding device and the welding method. The stirring friction welding device and the welding method aim at solving the problems that the root defects can easily generate on a conventional stirring friction welding head, the reliability of the welding head can not be guaranteed, and postwelding processing cost is increased. The stirring friction welding device comprises a stirring head assembly and a supporting base. The stirring head assembly is arranged above the supporting base and comprises an upper shaft shoulder, a stirring needle and a lower shaft shoulder. The upper shaft shoulder, the stirring needle and the lower shaft shoulder are connected into a whole in sequence in an end-to-end mode from top to bottom. A groove is formed in the middle of the supporting base. The lower end of the lower shaft shoulder corresponds to the groove in the middle of the supporting base. The diameter of the upper shaft shoulder is larger than that of the lower shaft shoulder, and the diameter of the lower shaft shoulder is larger than that of the stirring needle. The diameter of the upper shaft shoulder is larger than the width of the groove, and the width of the groove is larger than the diameter of the lower shaft shoulder. The stirring friction welding device avoiding forming the root defects is applied to the welding field.
Description
Technical field
The present invention relates to a kind of agitating friction welder and welding method, be specifically related to a kind of agitating friction welder and welding method of avoiding forming root defect.
Background technology
Friction stir welding is a kind of novel solid phase interconnection technique, when the low melting materials such as welding of aluminum, magnesium, has that welding quality is high, production cost is low and the various features such as non-environmental-pollution, thereby is rapidly developed and uses.But in the stir friction welding process of routine, mixing needle length is generally less than welded piece length, easily produces " lack of penetration (also claiming weak combination) " defective at the root of weld, thereby reduces bearing capacity, the especially fatigue behaviour of joint.Be created in the root of weld seam due to incomplete penetration defect, thereby often be called as root defect.This flaw size is less, is difficult to be detected by lossless detection methods such as the X ray of routine and ultrasonic waves, has larger harmfulness.In order to ensure the reliability of welding point, need to adopt the method for machining to remove certain thickness root of weld material after the agitating friction welding, this has not only caused waste, has increased welding cost, has also reduced welding production efficiency.
Summary of the invention
The present invention easily produces root defect for solving conventional friction stir welding, and Joint Reliability is difficult to guarantee, increases the problem of postwelding processing cost, and then propose a kind of agitating friction welder and welding method of avoiding forming root defect.
The present invention addresses the above problem the technical scheme of taking to be: the present invention includes stirring-head assembly and base for supporting, the stirring-head assembly is arranged on the top of base for supporting, the stirring-head assembly comprises the shaft shoulder, mixing needle and the lower shaft shoulder, the upper shaft shoulder, mixing needle and the lower shaft shoulder from top to bottom connect successively from beginning to end makes one, the middle part of base for supporting has groove, the lower end of the lower shaft shoulder is corresponding with the groove at base for supporting middle part, the diameter of the upper shaft shoulder is greater than the diameter of the lower shaft shoulder diameter greater than mixing needle, and the diameter of the upper shaft shoulder is greater than the width of the groove diameter greater than the lower shaft shoulder.
The concrete steps of welding method of the present invention are as follows:
Step 1, with fixture, the first welded piece and the second welded piece are fixed on the upper surface of base for supporting side by side, make a side of the first welded piece and a side contacts of the second welded piece, the contact-making surface of the first welded piece and the second welded piece is positioned at the top of groove center line;
Step 2, the stirring-head assembly is moved to the weld start position that the first welded piece and the second welded piece contact with each other, the stirring-head assembly is penetrated between the contact-making surface of the first welded piece and the second welded piece, until the degree of depth that upper shaft shoulder lower surface is pressed between the contact-making surface of the first welded piece and the second welded piece reaches setting value h from the top of the first welded piece and the second welded piece contact-making surface
1Till;
Step 3, the stirring-head assembly is moved ahead along the length direction of the contact-making surface of the first welded piece and the second welded piece, until welding is completed.
The invention has the beneficial effects as follows: mixing needle integral body of the present invention penetrates welded piece, can effectively avoid the generation of root defect; Lower shaft shoulder butt welded seam root of the present invention is played a supporting role, and prevents that weld metal from staying, and guarantees that weld seam back shaping is good; Gap between base for supporting recess sidewall of the present invention and lower shaft shoulder outline is less, can provide maximum support to the workpiece back, reduce the lower suffered load of the shaft shoulder, increase the workpiece heat radiation, avoid the inner defective that produces of weld seam, the present invention is simple in structure, and cost of manufacture is low, easy and simple to handle, be convenient to safeguard and long-term the use.
Description of drawings
Fig. 1 is overall structure schematic diagram of the present invention, and Fig. 2 is that the stirring-head assembly penetrates the cross sectional representation between the first welded piece and the second welded piece solder side.
The specific embodiment
the specific embodiment one: present embodiment is described in conjunction with Fig. 1 and Fig. 2, described a kind of agitating friction welder stirring-head assembly 1 and the base for supporting 2 of avoiding forming root defect of present embodiment, stirring-head assembly 1 is arranged on the top of base for supporting 2, stirring-head assembly 1 comprises shaft shoulder 1-1, mixing needle 1-2 and lower shaft shoulder 1-3, upper shaft shoulder 1-1, mixing needle 1-2 and lower shaft shoulder 1-3 from top to bottom successively head and the tail connect and make one, the middle part of base for supporting 2 has groove 2-1, the lower end of lower shaft shoulder 1-3 is corresponding with the groove 2-1 at base for supporting 2 middle parts, the diameter D0 of upper shaft shoulder 1-1 is greater than the diameter D2 of the lower shaft shoulder 1-3 diameter D1 greater than mixing needle 1-2, upper shaft shoulder 1-1 diameter D0 greater than groove 2-1 width L greater than lower shaft shoulder 1-3 diameter D2.
The specific embodiment two: present embodiment is described in conjunction with Fig. 2, the diameter D0 of the upper shaft shoulder 1-1 of the described a kind of agitating friction welder of avoiding forming root defect of present embodiment is 3 times～5 times of mixing needle 1-2 diameter D1, the diameter D2 of lower shaft shoulder 1-3 is 1.5 times～2.5 times of mixing needle 1-2 diameter D1, large 1～5 millimeter than the diameter D2 of lower shaft shoulder 1-3 of the width L of groove 2-1.Other composition and annexation are identical with the specific embodiment one.
The technique effect of present embodiment is: when guaranteeing that the root of weld does not produce defective, can provide maximum support to the workpiece back, reduce the lower suffered load of the shaft shoulder, increase the workpiece heat radiation, thereby avoid the inner defective that produces of weld seam.
The specific embodiment three: present embodiment is described in conjunction with Fig. 2, the diameter D0 of the upper shaft shoulder 1-1 of the described a kind of agitating friction welder of avoiding forming root defect of present embodiment is 4 times of mixing needle 1-2 diameter D1, the diameter D2 of lower shaft shoulder 1-3 is 2 times of mixing needle 1-2 diameter D1, large 2 millimeters than the diameter D2 of described lower shaft shoulder 1-3 of the width L of groove 2-1.Other composition and annexation are identical with the specific embodiment two.
The specific embodiment four: in conjunction with Fig. 1 and Fig. 2, present embodiment is described, the described a kind of concrete steps of utilizing the described device of the specific embodiment one to carry out friction stir welding method of present embodiment are as follows:
Step 1, with fixture, the first welded piece 3 and the second welded piece 4 are fixed on the upper surface of base for supporting 2 side by side, make a side of the first welded piece 3 and a side contacts of the second welded piece 4, the contact-making surface of the first welded piece 3 and the second welded piece 4 is positioned at the top of groove 2-1 center line;
Step 2, stirring-head assembly 1 is moved to the weld start position that the first welded piece 3 and the second welded piece 4 contact with each other, stirring-head assembly 1 is penetrated between the contact-making surface of the first welded piece 3 and the second welded piece 4, until the degree of depth that upper shaft shoulder 1-1 lower surface is pressed between the contact-making surface of the first welded piece 3 and the second welded piece 4 reaches setting value h from the top of the first welded piece 3 and the second welded piece 4 contact-making surfaces
1Till;
Step 3, stirring-head assembly 1 is moved ahead along the length direction of the contact-making surface of the first welded piece 3 and the second welded piece 4, until welding is completed.
The specific embodiment five: present embodiment is described in conjunction with Fig. 1 and Fig. 2, in the step 2 of the described a kind of friction stir welding method of avoiding forming root defect of present embodiment, the rotary speed of stirring-head assembly 1 is 500～2000 rev/mins, it is 0.5～2 milli m/min that stirring-head assembly 1 penetrates the speed that penetrates between the contact-making surface of the first welded piece 3 and the second welded piece 4, and the front line speed of stirring-head assembly 1 is 50～1000 millis m/min.Other composition and annexation are identical with the specific embodiment four.
The technique effect of present embodiment is: can make stirring-head assembly suffered load in penetrating the welded piece process less, guarantee stirring-head assembly reliability service in welding process, when obtaining good appearance of weld, avoid the root of weld and the inner defective that produces.
The specific embodiment six: present embodiment is described in conjunction with Fig. 1 and Fig. 2, in the step 2 of the described a kind of friction stir welding method of avoiding forming root defect of present embodiment, the rotary speed of stirring-head assembly 1 is 1000 rev/mins, it is 1 milli m/min that stirring-head assembly 1 penetrates the speed that penetrates between the contact-making surface of the first welded piece 3 and the second welded piece 4, and the front line speed of stirring-head assembly 1 is 200 millis m/min.Other composition and annexation are identical with the specific embodiment five.
The specific embodiment seven: in conjunction with Fig. 1 and Fig. 2, present embodiment is described, the length h of mixing needle 1-2 in the step 2 of the described a kind of friction stir welding method of avoiding forming root defect of present embodiment
3, the first welded piece 3 thickness h
2, upper shaft shoulder 1-1 is pressed into the degree of depth h between the contact-making surface of the first welded piece 3 and the second welded piece 4
1Satisfy following relation: h
2=h
1+ h
3, h wherein
1Be 0～0.5mm, the thickness of the first welded piece 3 is identical with the thickness of the second welded piece 4.Other composition and annexation are identical with the specific embodiment four.
The technique effect of present embodiment is: can guarantee that the upper and lower surface weld of weld seam is shaped good, the root of weld and inside do not produce defective.
Claims (7)
1. agitating friction welder of avoiding forming root defect, it comprises stirring-head assembly (1) and base for supporting (2), stirring-head assembly (1) is arranged on the top of base for supporting (2), it is characterized in that: stirring-head assembly (1) comprises the shaft shoulder (1-1), mixing needle (1-2) and the lower shaft shoulder (1-3), the upper shaft shoulder (1-1), mixing needle (1-2) from top to bottom connects successively from beginning to end with the lower shaft shoulder (1-3) makes one, the middle part of base for supporting (2) has groove (2-1), the lower end of the lower shaft shoulder (1-3) is corresponding with the groove (2-1) at base for supporting (2) middle part, the diameter (D0) of the upper shaft shoulder (1-1) is greater than the diameter (D2) of the lower shaft shoulder (1-3) diameter (D1) greater than mixing needle (1-2), the diameter (D0) of the upper shaft shoulder (1-1) is greater than the width (L) of groove (2-1) diameter (D2) greater than the lower shaft shoulder (1-3).
2. a kind of agitating friction welder of avoiding forming root defect according to claim 1, it is characterized in that: the diameter (D0) of the upper shaft shoulder (1-1) is 3 times～5 times of mixing needle (1-2) diameter (D1), the diameter (D2) of the lower shaft shoulder (1-3) is 1.5 times～2.5 times of mixing needle (1-2) diameter (D1), and the width (L) of groove (2-1) is than large 1～5 millimeter of the diameter (D2) of the lower shaft shoulder (1-3).
3. a kind of agitating friction welder of avoiding forming root defect according to claim 2, it is characterized in that: the diameter (D0) of the upper shaft shoulder (1-1) is 4 times of mixing needle (1-2) diameter (D1), the diameter (D2) of the lower shaft shoulder (1-3) is 2 times of mixing needle (1-2) diameter (D1), large 2 millimeters than the diameter D2 of the described lower shaft shoulder (1-3) of the width (L) of groove (2-1).
4. method of utilizing the described device of claim 1 to carry out agitating friction welding is characterized in that: the concrete steps of described a kind of friction stir welding method of avoiding forming root defect are as follows:
Step 1, with fixture, the first welded piece (3) and the second welded piece (4) are fixed on the upper surface of base for supporting (2) side by side, make a side of the first welded piece (3) and a side contacts of the second welded piece (4), the contact-making surface of the first welded piece (3) and the second welded piece (4) is positioned at the top of groove (2-1) center line;
Step 2, stirring-head assembly (1) is moved to the weld start position that the first welded piece (3) and the second welded piece (4) contact with each other, stirring-head assembly (1) is penetrated between the contact-making surface of the first welded piece (3) and the second welded piece (4) from the top of the first welded piece (3) and the second welded piece (4) contact-making surface, reach and set value h until the upper shaft shoulder (1-1) lower surface is pressed into the degree of depth between the contact-making surface of the first welded piece (3) and the second welded piece (4)
1Till;
Step 3, stirring-head assembly (1) is moved ahead, until welding is completed along the length direction of the contact-making surface of the first welded piece (3) and the second welded piece (4).
5. a kind of friction stir welding method of avoiding forming root defect according to claim 4, it is characterized in that: in step 2, the rotary speed of stirring-head assembly (1) is 500～2000 rev/mins, it is 0.5～2 milli m/min that stirring-head assembly (1) penetrates the speed that penetrates between the contact-making surface of the first welded piece (3) and the second welded piece (4), and the front line speed of stirring-head assembly (1) is 50～1000 millis m/min.
6. a kind of friction stir welding method of avoiding forming root defect according to claim 5, it is characterized in that: in step 2, the rotary speed of stirring-head assembly (1) is 1000 rev/mins, it is 1 milli m/min that stirring-head assembly (1) penetrates the speed that penetrates between the contact-making surface of the first welded piece (3) and the second welded piece (4), and the front line speed of stirring-head assembly (1) is 200 millis m/min.
7. a kind of friction stir welding method of avoiding forming root defect according to claim 4, is characterized in that: the length h of mixing needle in step 2 (1-2)
3, the first welded piece (3) thickness h
2, the upper shaft shoulder (1-1) is pressed into the degree of depth h between the contact-making surface of the first welded piece (3) and the second welded piece (4)
1Satisfy following relation: h
2=h
1+ h
3, h wherein
1Be 0～0.5mm, the thickness of the first welded piece (3) is identical with the thickness of the second welded piece (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100874928A CN103128437A (en) | 2013-03-19 | 2013-03-19 | Stirring friction welding device avoiding forming root defects and welding method |
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| CN2013100874928A CN103128437A (en) | 2013-03-19 | 2013-03-19 | Stirring friction welding device avoiding forming root defects and welding method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894726A (en) * | 2014-03-13 | 2014-07-02 | 哈尔滨工业大学 | Friction stir welding method capable of achieving back thickening to eliminate weak connection and adapting to plate thickness changes |
| CN108890116A (en) * | 2018-07-28 | 2018-11-27 | 天津大学 | Two-shipper process unit for the weldering of large-sized structural parts agitating friction |
| CN109290711A (en) * | 2018-11-29 | 2019-02-01 | 广东工业大学 | The welding method and welding equipment of door hinge and door-plate |
| CN109967856A (en) * | 2019-03-22 | 2019-07-05 | 哈尔滨工业大学 | A kind of friction stir welding method for realizing the servo-actuated support in back by magnetic force |
| CN110434450A (en) * | 2019-05-29 | 2019-11-12 | 陕西飞机工业（集团）有限公司 | A kind of Friction stir welding method of step type weld seam |
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| CN102794558A (en) * | 2011-05-27 | 2012-11-28 | 三菱重工业株式会社 | Friction stir welding tool and friction stir welding apparatus |
| JP2013000761A (en) * | 2011-06-15 | 2013-01-07 | Furukawa-Sky Aluminum Corp | Rotary joining tool for friction stir joining and friction stir joining method using the same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894726A (en) * | 2014-03-13 | 2014-07-02 | 哈尔滨工业大学 | Friction stir welding method capable of achieving back thickening to eliminate weak connection and adapting to plate thickness changes |
| CN108890116A (en) * | 2018-07-28 | 2018-11-27 | 天津大学 | Two-shipper process unit for the weldering of large-sized structural parts agitating friction |
| CN109290711A (en) * | 2018-11-29 | 2019-02-01 | 广东工业大学 | The welding method and welding equipment of door hinge and door-plate |
| CN109290711B (en) * | 2018-11-29 | 2023-09-12 | 广东工业大学 | Welding method and welding equipment for door hinge and door plate |
| CN109967856A (en) * | 2019-03-22 | 2019-07-05 | 哈尔滨工业大学 | A kind of friction stir welding method for realizing the servo-actuated support in back by magnetic force |
| CN110434450A (en) * | 2019-05-29 | 2019-11-12 | 陕西飞机工业（集团）有限公司 | A kind of Friction stir welding method of step type weld seam |
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Application publication date: 20130605 |