Gas shielded welding technology of steel Q420GJC for building structure

A Q420GJC, steel technology for building structures, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as welding cracks, unformed welding processes, and increased welding difficulty.

Active Publication Date: 2016-05-25
鞍钢钢结构(营口)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the steel Q420GJC used for building structures has high strength, and it is prone to cracks in welding, which increases the difficulty of welding. So far, there is no forming welding process

Method used

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  • Gas shielded welding technology of steel Q420GJC for building structure
  • Gas shielded welding technology of steel Q420GJC for building structure
  • Gas shielded welding technology of steel Q420GJC for building structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The base material is Q420GJC steel for building structure, thickness δ=25mm steel plate. Two test plates of the same base material are selected to be butted and flat-welded to form a welded test plate. The welding process is as follows:

[0036] 1) Adopt V-shaped groove R3=60°, such as figure 2 As shown, blunt edge H=2mm, root gap L=2mm.

[0037] 2) Use welding consumables produced by Wuhan Tiemao Welding Material Co., Ltd.

[0038] 3) Gas shielded welding machine: YD-500KR.

[0039] 4) Welding position: butt flat welding.

[0040] 5) Ambient temperature: -6.5°C.

[0041] 6) The preheating temperature is 150°C.

[0042] 7) Multi-layer multi-pass welding is used, and the interlayer temperature is 150-200 °C.

[0043] 8) The welding process parameters are shown in Table 1;

[0044] Table 1 δ=25mmQ420GJC steel gas shielded welding process parameters for building structures

[0045]

[0046] 9) The above-mentioned welded test plate is machined into samples accor...

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Abstract

The invention provides a gas shielded welding technology of steel Q420GJC for a building structure. The technology comprises the steps that a welding material is prepared, wherein welding wires WH5-GJ with the diameter phi of 1.2 mm are prepared; the welding environment temperature is higher than or equal to minus 10 DEG C; the preheating temperature is 100 DEG C-150 DEG C; multi-layer and multi-pass welding is performed, and the interlayer temperature is no lower than the preheating temperature; weld joint priming is performed, wherein the welding current is 240-260 A, the welding voltage is 26-28 V, the welding speed is 30-32 cm / min, and heat input is performed at 9.4-10.2 KJ / cm; weld joint filling is performed, wherein the welding current is 280-300 A, the welding voltage is 28-30 V, the welding speed is 34-36 cm / min, and heat input is performed at 10.4-11.3 KJ / cm; weld joint capping is performed, wherein the welding current is 300-320 A, the welding voltage is 28-30 V, the welding speed is 36-38 cm / min, and heat input is performed at 10.5-11.4 KJ / cm. Q420GJC steel welding is performed by adopting the welding technology, the mechanical property same as that of base metal is obtained, the quality requirements of engineering welding are met, and a gap of gas shielded welding of the Q420GJC steel is filled.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a gas shielded welding process for steel Q420GJC used in building structures. Background technique [0002] Since the rise of steel structure buildings in Europe in the 1950s, they have many special advantages such as superior earthquake resistance, environmental protection, high construction efficiency, and high space utilization, and have now become the development direction of international building structures. In recent years, a large number of steel structure buildings have been built in our country. The safety of steel structure buildings is very important, and there are special technical requirements for the steel used. [0003] Steel for building structures has properties such as earthquake resistance and low-temperature impact resistance. Compared with ordinary carbon and low-alloy steels, the upper limit of yield strength is set, and the tensile strength is improved. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K103/04
CPCB23K9/16B23K9/235B23K2103/04
Inventor 马丽姚鸿宇谷飚胡金旭闫红霞
Owner 鞍钢钢结构(营口)有限公司
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