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a welding method

A technology of double-sided welding and welding wire, used in welding equipment, welding accessories, arc welding equipment, etc., can solve the problem of incomplete fusion of welds, and achieve the effect of ensuring full penetration

Active Publication Date: 2021-11-09
BEIJING SUBWAY ROLLING STOCK EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the root of the traditional metal gas shielded welding seam is prone to lack of fusion at the root

Method used

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Embodiment 1

[0035] like figure 2 As shown, a single-sided welding method, the base metal 1 is made of fine-grained structural steel, the plate thickness is 8mm-20mm, the angle of the groove 6 is 30°-50°, and the distance 7 between the front ends of the two base metals 1 is 2- 3mm, the specific steps are as follows:

[0036] S1. Use tungsten inert gas shielded welding to perform back welding on the weld to be welded between the two base metals 1. The welding current for back welding is 120-130A, the voltage is 14-16V, and the welding speed is 1-3mm / s, the shielding gas is Ar99.99%, the shielding gas flow rate is 10-15L / min, and the welding wire with a diameter of 2.2mm is used for root welding to form the root weld 4 of tungsten inert gas shielded welding;

[0037] S2. Use metal gas shielded welding to fill the weld seam after root welding. The welding current of filling welding is 240-260A, the voltage is 26-28V, the welding speed is 4-6mm / s, and the shielding gas is Ar80%+ CO 2 20%,...

Embodiment 2

[0042] like image 3 As shown, a double-sided welding method, the base metal 1 is made of fine-grained structural steel, the plate thickness is 8mm-20mm, the angles of the grooves 6 on both sides are 30°-50°, and the distance between the front ends of the two base metals 1 7 is 2-3mm, the specific steps are as follows:

[0043] S1. Use tungsten inert gas shielded welding to perform back welding on the front weld seam between the two base metals. The welding current for back welding is 120-130A, the voltage is 14-16V, and the welding speed is 1-3mm / s, the shielding gas is Ar99.99%, the shielding gas flow rate is 10-15L / min, and the welding wire with a diameter of 2.2mm is used for backing welding;

[0044] S2. Grind the area to be welded on the back, and use tungsten inert gas shielded welding to perform back welding on the back weld between the two base metals. The welding current of the back welding is 120-130A, and the voltage is 14-16V. The welding speed is 1-3mm / s, the ...

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Abstract

The invention discloses a welding method, which relates to the field of welding technology. Tungsten inert gas shielded welding is used for bottom welding, and molten electrode gas shielded welding is used for filling welding and cover welding of the weld seam after bottom welding, effectively Guaranteed full penetration of the root of the weld.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a welding method. Background technique [0002] When welding two base metals whose grooves are V-shaped or Y-shaped, firstly combine them according to the requirements of the welding process. Welding method, welding material specifications, current, voltage and other parameters are welded in sequence according to the order of priming, filling and covering. Gas metal arc welding refers to a welding method that uses the arc generated between the welding wire and the base metal as a heat source to melt the metal. During the welding process, the molten pool and welding area formed by arc melting welding wire and base metal are protected by inert gas or active gas, which can effectively prevent the harmful effects of ambient air. However, when traditional MIG welding is used, the root of the weld is prone to the problem of unfused root defects. If such defects exist in the weldment,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/173B23K9/32
CPCB23K9/167B23K9/173B23K9/32
Inventor 刘旭李金友关卓刘洋刘亚璇崔洪涛宋宇王岩李佩佩曹兵
Owner BEIJING SUBWAY ROLLING STOCK EQUIP
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