CN1481961A - Highly effective monofilament narrow clearance active gas protecting welding method - Google Patents
Highly effective monofilament narrow clearance active gas protecting welding method Download PDFInfo
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- CN1481961A CN1481961A CNA031296297A CN03129629A CN1481961A CN 1481961 A CN1481961 A CN 1481961A CN A031296297 A CNA031296297 A CN A031296297A CN 03129629 A CN03129629 A CN 03129629A CN 1481961 A CN1481961 A CN 1481961A
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Abstract
The efficient single-filament narrow-gap active protected welding method belongs to the field of welding technology. The present invention adopts ternary protecting gas comprising oxygen, carbon dioxide and argon and welding filament in the center, and controls the extended length of large welding filament, filament feeding speed and voltage to obtain stable rotary ejecting transition mode so as to realize the well fusion between the inner groove weld bead and workpiece in certain gap. The present invention has simple regulation, convenient operation, fast welding filament feeding speed and high welding efficiency, and can realize narrow gap welding with central single filament, single weld bead and several layers.
Description
Technical field
What the present invention relates to is a kind of protection welding method, and particularly a kind of efficient single-filament narrow-gap active gas shielded arc welding connects method, belongs to welding technology field.
Background technology
Narrow gap welding has connect since proposing the sixties in 20th century, and the Welder author of various countries has invented a large amount of narrow gap welding connection technologies.Mode with the droplet transfer in single-filament narrow-gap gas shield solder technology can be divided three classes: short circuiting transfer mode, spray transfer mode, rotating jet transient mode.Wherein the technical difficult points of Cun Zaiing is how to guarantee the abundant penetration of side energy of narrow groove depths, thus and the splashing influence of reduction in the minimizing welding process to follow-up welding bead welding quality.
Find by literature search; Chinese patent application number is: 01138322.4; patent name is: the ultra-narrow gap ultra-low linear energy metal gas automatic arc welding method and apparatus; patent publication No. is: CN 1367060A; this patent disclosure a kind of short circuiting transfer mode narrow gap welding connection technology, the ultra-narrow gap of employing≤6nm, monofilament do not have electric arc lateral deviation technology between two parties in conjunction with the ultralow spatter loss coefficient Waveform Control pulse power; high voltage with pulse is realized side penetration, and minimizing is splashed.Its shortcoming is that wire melting efficient is not high, the parameter adjustment complexity.Also find in the retrieval, people such as Bai Gang, Zhu Yurong is in " solder technology " first phase in 1998, write articles " exploitation that pulse rotating spray transfer MAG welding technology is adopted in narrow gap welding " on 2～4 pages, this article has been introduced the mode that adopts pulse and has been obtained the narrow gap welding of rotating jet transient mode and connect.It is many that its shortcoming is to regulate parameter, the adjustment process complexity, and limited by pulse mode, speed of welding and welding wire melting rate are all lower.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide a kind of efficient single-filament narrow-gap active gas shielded arc welding to connect method, carry out the continuous multilayer welding by having adopted monofilament single track individual layer placed in the middle; it is simple that it is regulated; easy to operate, wire feed rate is fast simultaneously, welding production efficiency height.
The present invention is achieved by the following technical solutions; the ternary protective gas that the present invention adopts oxygen, carbon dioxide, argon gas to form; welding wire is arranged between two parties; obtain stable rotation spray transfer mode by controlling big electrode extension, wire feed rate and voltage, realize the good fusion between interior welding bead of certain interval groove and the workpiece sidewall.
Described groove can be I type or double V-groove, for I type groove, and 12 millimeters to 19 millimeters of the interstice coverages between workpiece.For double V-groove, the minimum clearance of workpiece is more than or equal to 3 millimeters, and the maximal clearance is 12 millimeters to 19 millimeters, and the angular range 0 between two workpiece grooves faces is spent to 20 degree, and finally controls the size of maximal clearance.The present invention especially is fit to thickness more than or equal to 26 millimeters workpiece.
Described ternary protective gas is made up of oxygen, carbon dioxide, argon gas, and wherein oxygen 0.5～3%, carbon dioxide 1～15%, and all the other are argon gas; Described big electrode extension is 15～40mm, and wire feed rate can be set in greater than 12m/min; Described voltage, it changes with wire feed rate, electric arc, is as the criterion to obtain stable rotation spray transfer mode, promptly should be controlled at make arc length more than or equal to 3mm smaller or equal in the 6mm scope.If arc voltage too dwindles when causing arc length too short, can in welding process, be short-circuited, thereby be easy in weld seam, produce pore; When causing arc length long, thereby will cause alloying element scaling loss in the droplet transfer process seriously to be unfavorable for the mechanical property of weld seam if arc voltage is too high.
Because the synergy of resistance heat that big electrode extension produces and the heating of electric arc anode spot, wire tip is softening, liquid metal is in plasma jet power, the recoil strength of anode spot evaporation of metal, the effect of surface tension and electromagnetic force is elongated down, depart from the welding wire axis of movement and rotate around this axis, the arc cathode spot that is positioned at the molten bath will be followed anode spot according to principle of minimum voltage and be rotated, form the rotating jet transition, the high-temperature area of electric arc no longer is confined under the welding wire, but with the sidewall of certain frequency rotation heated parts, high temperature by electric arc heats the good fusion that realizes welding bead and workpiece sidewall, thereby realizes the single track individual layer welding of this weld seam.When finishing this layer welding, only need welding gun is raised the thickness of this layer weld seam for I shape groove, can carry out the welding of new one deck; Can finely tune voltage as required for V-butt and can carry out the welding of new one deck, finally finish the gas shield welding of the narrow gap of continuous single track multilayer.
The present invention has substantive distinguishing features and marked improvement, and the present invention regulates simply, and is easy to operate, and wire feed rate is fast simultaneously, welding production efficiency height.Owing to adopted monofilament single track individual layer placed in the middle to carry out the continuous multilayer welding, need the few and easy adjustment of parameter of adjustment, the welding wire melting rate height, speed of welding is fast, do not need complicated wire bending mechanism or the ignition tip rotating mechanism and the pulse power, can realize that monofilament is placed in the middle, the narrow gap welding of single track multilayer connects.
The specific embodiment
Provide following examples in conjunction with content of the present invention:
Describe the specific implementation process that a kind of efficient single-filament narrow-gap active gas shielded arc welding connects method in detail below in conjunction with embodiment.
Adopt double V-groove, thickness of workpiece is 28 millimeters, and minimum clearance is 4 millimeters, and bevel angle is 20 degree, and the maximal clearance is 14 millimeters, and width is 180 millimeters, and length is 610 millimeters, and material of test piece is the banjo fixing butt jointing of ASTM A572, and the welding position is downhand welding.Solder wire material is ER50S-G, 1.2 millimeters of diameters.Adopt the common flat external characteristics source of welding current, the conductive mechanism by cable, welding gun couples together the positive pole of ignition tip, welding wire and the source of welding current, couples together by the negative pole of cable with the workpiece and the source of welding current.The flow of protection air-flow is 60L/min.By the welding gun governor motion that is loaded on the welding tractor welding wire is occupy the groove intermediate arrangement, regulate the height of ignition tip apart from workpiece by the welding gun height adjustment mechanism, speed of welding is regulated by the speed of travel of regulating welding tractor.Welding variables shown in the employing table 1 is carried out semi-automatic continuous welding, and the wire feed rate when wherein ground floor welds is set and is about 12m/min, and the wire feed rate of follow-up three layers of welding is set and is about 36m/min.Finish the welding 24 hours after to the whole piece weld seam segmentation carry out x-ray inspection, the result all reaches the A-class picture requirement.Prepare side bend specimen according to GB2649-89, carry out bend test according to GB2653-89, institute's side bend specimen of getting is all qualified, does not find sidewall incomplete fusion defective.This shows this method welding efficiency height, regulate simple.
Table 1 welding variables
| The test plate (panel) numbering | The welding number of plies | Protective gas | Welding wire extension (mm) | Speed of welding (m/min) | Wire feed rate (m/min) | Welding current (A) | Weldingvoltage (V) |
| ????1 | ????4 | ??0.5％O 2+1 ??％CO 2+Ar | ????32 | ?0.3～0.55 | ??12～36 | ?320～590 | ??29～45 |
| ????2 | ????4 | ??3％O 2+5％ ??CO 2+Ar | ????40 | ?0.3～0.55 | ??12～36 | ?320～590 | ??29～45 |
| ????3 | ????4 | ?0.5％O 2+15 ?％CO 2+Ar | ????15 | ?0.3～0.55 | ??12～36 | ?320～590 | ??29～45 |
Claims (6)
1, a kind of efficient single-filament narrow-gap active gas shielded arc welding connects method; it is characterized in that; the ternary protective gas that adopts oxygen, carbon dioxide, argon gas to form; welding wire is arranged between two parties; obtain stable rotation spray transfer mode by controlling big electrode extension, wire feed rate and voltage, realize the good fusion between interior welding bead of certain interval groove and the workpiece sidewall.
2, efficient single-filament narrow-gap active gas shielded arc welding according to claim 1 connects method, it is characterized in that, described ternary protective gas is made up of oxygen, carbon dioxide, argon gas, and wherein oxygen 0.5～3%, carbon dioxide 1～15%, and all the other are argon gas.
3, efficient single-filament narrow-gap active gas shielded arc welding according to claim 1 connects method, it is characterized in that, described big electrode extension is 15～40mm, and wire feed rate is set in greater than 12m/min.
4, efficient single-filament narrow-gap active gas shielded arc welding according to claim 1 connects method; it is characterized in that; described groove is I type or double V-groove; for I type groove, 12 millimeters of interstice coverages between workpiece are to 19 millimeters, for double V-groove; the minimum clearance of workpiece is more than or equal to 3 millimeters; the maximal clearance is 12 millimeters to 19 millimeters, and the angular range 0 between two workpiece grooves faces is spent to 20 degree, and finally controls the size of maximal clearance.
5, efficient single-filament narrow-gap active gas shielded arc welding according to claim 1 connects method; it is characterized in that; described voltage; it changes with wire feed rate, electric arc; be as the criterion to obtain stable rotation spray transfer mode, promptly should be controlled at make arc length more than or equal to 3mm smaller or equal in the 6mm scope.
6, efficient single-filament narrow-gap active gas shielded arc welding according to claim 1 connects method, it is characterized in that, especially is fit to thickness more than or equal to 26 millimeters workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03129629 CN1263577C (en) | 2003-07-03 | 2003-07-03 | Highly effective monofilament narrow clearance active gas protecting welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03129629 CN1263577C (en) | 2003-07-03 | 2003-07-03 | Highly effective monofilament narrow clearance active gas protecting welding method |
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| Publication Number | Publication Date |
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| CN1481961A true CN1481961A (en) | 2004-03-17 |
| CN1263577C CN1263577C (en) | 2006-07-12 |
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| CN 03129629 Expired - Fee Related CN1263577C (en) | 2003-07-03 | 2003-07-03 | Highly effective monofilament narrow clearance active gas protecting welding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513663A (en) * | 2011-12-28 | 2012-06-27 | 上海宝钢车轮有限公司 | Protection gas for welding steel wheel |
| CN107088693A (en) * | 2016-08-08 | 2017-08-25 | 温州宝通机械制造有限公司 | A kind of alloying pellet bead-welding technology |
-
2003
- 2003-07-03 CN CN 03129629 patent/CN1263577C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513663A (en) * | 2011-12-28 | 2012-06-27 | 上海宝钢车轮有限公司 | Protection gas for welding steel wheel |
| CN107088693A (en) * | 2016-08-08 | 2017-08-25 | 温州宝通机械制造有限公司 | A kind of alloying pellet bead-welding technology |
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| Publication number | Publication date |
|---|---|
| CN1263577C (en) | 2006-07-12 |
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Address after: No. 1954, Huashan Road, Shanghai, China: 200030 Co-patentee after: Baosteel Construction Co.,Ltd. Patentee after: Shanghai Jiao Tong University Address before: No. 1954, Huashan Road, Shanghai, China: 200030 Co-patentee before: Guandaer Steel Structure Co., Ltd., Shanghai Patentee before: Shanghai Jiao Tong University |
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Granted publication date: 20060712 Termination date: 20100703 |