Union melt welding process for steel Q420GJC for building structures

A technology for automatic submerged arc welding of steel for building structures, applied in welding equipment, arc welding equipment, welding/welding/cutting items, etc., can solve problems such as cracks in welding, welding process without forming, and increased welding difficulty

Active Publication Date: 2016-04-20
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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  • Union melt welding process for steel Q420GJC for building structures
  • Union melt welding process for steel Q420GJC for building structures
  • Union melt welding process for steel Q420GJC for building structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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:

[0038] 1) Adopt V-shaped groove R3=60°, such as figure 2 As shown, blunt edge H=4mm, root gap L=0mm.

[0039] 2) Use welding consumables produced by Wuhan Tiemao Welding Material Co., Ltd.

[0040] 3) Submerged arc automatic welding machine: ZD5-1600.

[0041] 4) Welding position: butt flat welding.

[0042] 5) Ambient temperature: -6.5°C.

[0043] 6) The preheating temperature is 150°C.

[0044] 7) Multi-layer multi-pass welding is used for welding: the temperature between layers is 150-200 °C.

[0045] 8) The welding process parameters are shown in Table 1;

[0046] Table 1 δ=25mmQ420GJC steel submerged arc automatic welding process parameters for building structures

[0047]

[0048] 9) The above-mentioned welded test pl...

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Abstract

The invention discloses a union melt welding process for steel Q420GJC for building structures. Welding materials include a welding wire MCJ55GJ with a diameter being phi 4.0mm and a welding flux SJ101; a welding environment temperature is higher than or equal to -10 DEG C; a preheating temperature is 100-150 DEG C; multi-layer and multi-pass welding are adopted, and an interlayer temperature is not lower than the preheating temperature. Conditions of backing weld include that a welding current is 520-530A, a welding voltage is 28-30V, a welding speed is 34-35.5cm/min, and thermal input is 21.3-22.8KJ/cm. Conditions of filling weld include that a welding current is 530-540A, a welding voltage is 30-32V, a welding speed is 36-37cm/min, and thermal input is 22.5-23.8KJ/cm. Conditions of cosmetic weld include that a welding current is 535-545A, a welding voltage is 28-30V, a welding speed is 34-35cm/min, and thermal input is 22.4-23.8KJ/cm. By the union melt welding process, equality in mechanical property of welds and base materials can be realized so as to meet requirements on engineering welding quality, and a gap of union melt welding of the steel Q420GJC is filled.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a submerged arc automatic welding process for building structure steel Q420GJC. 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): B23K9/18B23K9/235B23K9/095
CPCB23K9/095B23K9/18B23K9/235B23K2103/04
Inventor 马丽谷飚姚鸿宇胡金旭袁旭东
Owner 鞍钢钢结构(营口)有限公司
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