CN103056540B - Strength testing method for stainless steel multi-layer plate resistance spot welding joint before welding - Google Patents
Strength testing method for stainless steel multi-layer plate resistance spot welding joint before welding Download PDFInfo
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- CN103056540B CN103056540B CN201210552477.1A CN201210552477A CN103056540B CN 103056540 B CN103056540 B CN 103056540B CN 201210552477 A CN201210552477 A CN 201210552477A CN 103056540 B CN103056540 B CN 103056540B
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Abstract
A strength testing method for a stainless steel multi-layer plate resistance spot welding joint before welding includes selection and use of a spot welding testing plate, a lap joint method of the testing plate and lowest strength standard calculation of a spot welding test. The method is simple and reasonable in process. The method is applied from production of austenitic stainless steel automobiles to this day, a lot of automobiles are operated in an owner scene, and breaking of welding of resistance welding spots is avoided so as to prove the reliability of the method.
Description
Technical field
The present invention relates to the strength test technique before a kind of stainless steel multilayer plate joint for resistance spot welding welding.
Background technology
The vehicle of stainless steel is long, lightweight with its life-span, not application of surface obtains user's favor, can realize again smoke dust, noiseless green production simultaneously.Austenitic stainless steel its pyroconductivity compared with carbon steel is 1/3 of carbon steel, linear expansion coefficient is 1.5 times of carbon steel, resistivity is 5 times of carbon steel, stainless these performances determine inapplicable employing melting, and melting also can produce the weld defects such as welding deformation, stress corrosion, intercrystalline corrosion in addition.Adopt resistance spot welding without adding welding material, improve property of welded joint simultaneously, can realize automation.Resistance spot welding is to rely on spot-welding equipment to complete production completely, and before production goes into operation, the parameter of how to confirm spot welding is accurately rationally, can ensure the intensity of welding point, and impression, in critical field, does not affect the appearance simultaneously.The strength test technology of research tack-weld is very important, and especially many difficult problems of snapping, have appearred in the project organization of the vehicle multiple-plate joint form more than two-ply aborning.By the spot-welding test of the different joint forms of multi-layer sheet (more than 2 layers) material repeatedly, the version of optional test sheet, shearing repeatedly and the engineer testing of macroscopical golden picture, the shear strength standard of analysis of material, find the joint for resistance spot welding strength test technique of a set of multi-layer sheet austenitic stainless steel material, best test technology and intensitometer basis of calculationJi are formulated, instruct and produce, effect is very good aborning, for the successful development of stainless steel vehicle resistance spot welding provides technical guarantee.
Summary of the invention
The object of this invention is to provide the strength test technique before a kind of stainless steel multilayer plate joint for resistance spot welding welding, to rationally determine accurately the parameter of spot welding, ensure the intensity of welding point.
For achieving the above object, the invention provides the front Strength Testing Methods of a kind of stainless steel multilayer plate joint for resistance spot welding welding, it is characterized in that comprising the following steps:
1, selecting of spot-welding test sheet: unit is mm
0.3≤thickness <0.8, wide by 20, amount of lap 20, test film length 75, spacing jig is from 70;
0.8≤thickness <1.3, wide by 30, amount of lap 30, test film length 100, spacing jig is from 90;
1.3≤thickness <2.5, wide by 40, amount of lap 40, test film length 125, spacing jig is from 100;
2.5≤thickness <5, wide by 50, amount of lap 50, test film length 150, spacing jig is from 110;
2, the overlapping mode of test film
(1) the C type welding gun equipment to upper and lower straight electrode form, first by two test film spot welding, and then with another test film spot welding;
(2) the welding gun equipment to single-side double-point form, first, by two groups of two test film spot welding, is placed on copper platform, and then the two ends of another test film is placed in respectively above the end of these two groups of test films;
3, the minimum intensity criterion calculation of spot-welding test
(1) thickness is determined: using two test films of spot welding in advance as a single piece, thickness be two test films thickness and, if in the thickness of two test films and the scope that specifies in the 1st step, can directly use two test films thickness and, if in the thickness of two test films and the scope that do not specify in the 1st step, a upwards approximate grade;
(2) material is determined: the shear strength of two test films of spot welding more in advance, select the weak material of intensity;
(3) stretching shearing strength is determined: the shear strength taking the weak test film of intensity in two test films of spot welding is in advance multiplied by 0.75 as spot welding in advance as unitarily formed stretching shearing strength;
(4) spot welding is more in advance the minimum stretch shearing strength of unitarily formed stretching shearing strength and another test film, get minimum stretch shearing strength and be multiplied by 1.3 the income value minimum shear strength as the overlap joint combining form joint described in second step, spot welding completes at least 3 group tests, and result is all greater than the minimum shear strength of the overlap joint combining form joint described in second step, records welding parameter.
Technique advantages of simple of the present invention, starts application so far from producing the vehicle of austenitic stainless steel, and a lot of vehicles move at owner scene, do not occur the problem that resistance spot weld snaps, and this suffices to show that reliability of the present invention.
Detailed description of the invention
The Welding Structure of the single-side double-point that segmentation side wall spot-welding equipment completes, stiffening plate 0.8HT+ heel post 1.5ST+ Side fascia 2.0DLT, analytic product frame mode, determines following spot welding mode, (0.8HT+1.5ST)+2.0DLT.
1, determine the size of test film, the material selection width 30mm of 0.8HT, length is 100mm, and 1.5ST selects width 40mm, and length is 125mm, and 2.0 DLT select width 40mm, and length is 125mm.
2,2 kinds of parts in bracket are considered to 1 single piece, thickness is 0.8+1.5=2.3, is approximately equal to the part of 2.5 thicknesss of slab.
3, material is selected: compare by the shear strength of HT and ST, get weak material, select ST grade.
4, be similar to 2 combinations of materials in bracket are regarded as to 2.5ST, look into the minimum stretch of standard 2.5ST and cut off load N1=19417N, with 0.75 times of calculating income value N2 of this numerical value, N2=19417X0.75=14562.75N.
5, the minimum stretch of looking into 2.0DLT is cut off load value N3, N3=14220N.
6, relatively N2 and N3 minimum stretch are cut off magnitude of load, N2 > N3, and the material of cutting off load taking weak minimum stretch is as standard material, and taking 2.0DLT as standard, minimum shear strength is 14220X1.3=18486N; If N2 < is N3, the material of cutting off load taking weak minimum stretch is as standard material, taking N2=14562.75 as standard, and 1456.75X1.3=18930N, minimum shear strength is 18930N.
Claims (1)
1. a Strength Testing Methods before the welding of stainless steel multilayer plate joint for resistance spot welding, is characterized in that comprising the following steps:
The first step: the selecting of spot-welding test sheet: unit is mm
0.3≤thickness <0.8, wide by 20, amount of lap 20, test film length 75, spacing jig is from 70;
0.8≤thickness <1.3, wide by 30, amount of lap 30, test film length 100, spacing jig is from 90;
1.3≤thickness <2.5, wide by 40, amount of lap 40, test film length 125, spacing jig is from 100;
2.5≤thickness <5, wide by 50, amount of lap 50, test film length 150, spacing jig is from 110;
Second step: the overlapping mode of test film
(1) the C type welding gun equipment to upper and lower straight electrode form, first by two test film spot welding, and then with another test film spot welding;
(2) the welding gun equipment to single-side double-point form, first, by two groups of two test film spot welding, is placed on copper platform, and then the two ends of another test film is placed in respectively above the end of these two groups of test films;
The 3rd step: the minimum intensity criterion calculation of spot-welding test
(1) thickness is determined: using two test films of spot welding in advance as a single piece, thickness be two test films thickness and, if in the thickness of two test films and the scope that specifies in the first step, can directly use two test films thickness and, if in the thickness of two test films and the scope that do not specify in the first step, a upwards approximate grade;
(2) material is determined: the shear strength of two test films of spot welding more in advance, select the weak material of intensity;
(3) stretching shearing strength is determined: the shear strength taking the weak test film of intensity in two test films of spot welding is in advance multiplied by 0.75 as spot welding in advance as unitarily formed stretching shearing strength;
(4) spot welding is more in advance the minimum stretch shearing strength of unitarily formed stretching shearing strength and another test film, get minimum stretch shearing strength and be multiplied by 1.3 the income value minimum shear strength as the overlap joint combining form joint described in second step, spot welding completes at least 3 group tests, and result is all greater than the minimum shear strength of the overlap joint combining form joint described in second step, records welding parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210552477.1A CN103056540B (en) | 2012-12-19 | 2012-12-19 | Strength testing method for stainless steel multi-layer plate resistance spot welding joint before welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210552477.1A CN103056540B (en) | 2012-12-19 | 2012-12-19 | Strength testing method for stainless steel multi-layer plate resistance spot welding joint before welding |
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| Publication Number | Publication Date |
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| CN103056540A CN103056540A (en) | 2013-04-24 |
| CN103056540B true CN103056540B (en) | 2014-11-05 |
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| CN201210552477.1A Expired - Fee Related CN103056540B (en) | 2012-12-19 | 2012-12-19 | Strength testing method for stainless steel multi-layer plate resistance spot welding joint before welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104227259B (en) * | 2014-09-09 | 2016-01-27 | 长春轨道客车股份有限公司 | Stainless steel car body seam weldering welding equipment welding technological properties checking process |
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| TW309483B (en) * | 1995-10-31 | 1997-07-01 | Hewlett Packard Co | |
| JP4528089B2 (en) * | 2003-10-22 | 2010-08-18 | 新日本製鐵株式会社 | Large heat input butt welded joints for ship hulls with brittle fracture resistance |
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Granted publication date: 20141105 Termination date: 20211219 |
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