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Wide gap welding method and welding part

A welding method and wide-gap technology, applied in welding medium, welding equipment, welding equipment, etc., can solve the problems of poor strength and prone to cracks at the weld, and achieve the effect of improving strength, good quality and high strength

Inactive Publication Date: 2018-11-30
四川汇源钢建装配建筑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a wide-gap welding method, aiming to improve the existing wide-gap welding method, which is prone to cracks after welding and the problems of poor strength at the weld

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A wide gap welding method, comprising the steps of:

[0041] Clean the parts to be welded with a groove depth of 10mm and a welding width of 5mm, wash off the dirt on the surface and dry it, and use sandpaper to grind off the oxide layer on the surface, and ensure that the groove and the distance from the groove are 40mm There is no oil stain inside, and the surface of the backing plate with a thickness of 3mm that is the same as the material to be welded is cleaned so that the surface of the backing plate is free of oil stains. After the weldment is cleaned up, the backing plate is welded in the middle of the groove. The welding method adopts metal gas shielded welding, and the various parameters during welding are the same as the following welding contents.

[0042] After the backing plate is welded, preheat the part to be welded to 210°C. Power up the welding tool, use MIG shielded arc welding, and weld the grooves on both sides of the backing plate in turn. During ...

Embodiment 2

[0045] A wide gap welding method, comprising the steps of:

[0046]Clean the parts to be welded with a groove depth of 50mm and a welding width of 9mm, wash off the dirt on the surface and dry them, and use sandpaper to grind off the oxide layer on the surface, and ensure that the groove and the distance from the groove are 40mm There is no oil stain inside, and the surface of the backing plate with a thickness of 15mm that is the same as the material to be welded is cleaned so that the surface of the backing plate is free of oil stains. After the weldment is cleaned up, the backing plate is welded in the middle of the groove. The welding method adopts metal gas shielded welding, and the various parameters during welding are the same as the following welding contents.

[0047] After the backing plate is welded, preheat the part to be welded to 230°C. Power up the welding tool, adopt MIGA welding, and weld the grooves on both sides of the backing plate in turn. During the weld...

Embodiment 3

[0050] A wide gap welding method, comprising the steps of:

[0051] Clean the parts to be welded with a groove depth of 20mm and a welding width of 6mm, rinse off the dirt on the surface and dry it, and use sandpaper to grind off the oxide layer on the surface, and ensure that the groove and the distance from the groove are 40mm There is no oil stain inside, and the surface of the backing plate with a thickness of 5mm that is the same as the material to be welded is cleaned so that the surface of the backing plate is free of oil stains. After the weldment is cleaned up, the backing plate is welded in the middle of the groove. The welding method adopts metal gas shielded welding, and the various parameters during welding are the same as the following welding contents.

[0052] After the backing plate is welded, preheat the part to be welded to 220°C. Power up the welding tool, use MIG shielded arc welding, and weld the grooves on both sides of the backing plate in turn. During...

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Abstract

The invention relates to the technical field of welding, and provides a wide gap welding method. The method is used for welding of a gap with the welding width ranging from 5 mm to 9 mm, and the method comprises the steps that a gasket plate with the material the same with that of a part to be welded is additionally welded to the middle of a groove, and the part to be welded is preheated to 210 to230 DEG C; when the temperature of the part to be welded reaches 210 to 230 DEG C, welding is carried out, in the welding process, the part to be welded is subject to heat preservation, the part to be welded is kept at 210 to 230 DEG C, gas metal arc welding is adopted to carry out welding on the two sides of the gasket plate in sequence; after welding is finished, cooling is carried out, when the temperature reduction rate of the welding line is controlled to range from 230 to 500 DEG C / h, in the cooling process, and the welding part is still subject to heat preservation; when the temperature of the welding line is reduced to 210 to 230 DEG C, heat preservation is stopped, and the whole cooling rate of the welding part is controlled to range from 50 to 80 DEG C / h. The welding part obtained through the welding of the method is free of crack and is high in strength. The invention further provides the welding part. The welding part is obtained through the wide gap welding method.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a wide-gap welding method and a weldment. Background technique [0002] Welding, also known as welding or welding, is a manufacturing process and technology that uses heat, high temperature or high pressure to join metal or other thermoplastic materials such as plastics. The scope of welding involves too many fields, especially in the industry, which occupies an important position. Wide gap welding is the welding method when the width of the weldment to be welded is large. The existing wide gap welding technology is easy to cause cracks due to unreasonable welding method settings. There is a problem of poor strength at the weld. [0003] In view of this, the present application is proposed. Contents of the invention [0004] The invention provides a wide-gap welding method, aiming to improve the existing wide-gap welding method, which is prone to cracks after welding and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K33/00B23K35/38
CPCB23K9/173B23K9/235B23K33/004B23K35/383
Inventor 蔡建利龙太海王杜槟林永刚陈启超游义才李伟汤春林周文明
Owner 四川汇源钢建装配建筑有限公司
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