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Welding technique for rolled steel

A welding process and welding speed technology, applied in the field of steel welding, can solve the problems of serious heat-affected zone embrittlement, reducing austenite stability, increasing austenite overheating, etc., reducing infrastructure investment and reducing steel consumption. , the effect of increased stability

Inactive Publication Date: 2008-09-10
ZHEJIANG SHENGDA STEEL TOWER +2
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Problems solved by technology

The use of larger welding heat energy can reduce the hardening tendency, but due to the large hardening tendency of this steel, it is often difficult to avoid the formation of martensite only by increasing the heat input energy, but instead increases the overheating and welding of austenite. Reduce the stability of austenite, promote the formation of coarse martensite, and make the embrittlement of the heat-affected zone more serious

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  • Welding technique for rolled steel

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] refer to figure 1 , a welding process for ASTM A572 GR.65 steel, in an operating environment above 5°C, using argon and carbon dioxide mixed gas shielded welding for bottom welding, using argon / carbon dioxide mixed gas shielded welding for filling and cover welding , follow these steps:

[0037] The present invention carries out rigorous and detailed design on the process, and provides a normative process operation code for the welding of ASTM A572 GR.65 steel.

[0038] (1). Determination of welding process parameters

[0039] The heat-affected zone of ASMT A572 GR.65 steel is prone to produce low-plasticity hardened structure, and the hardening tendency increases with the increase of material thickness, which is prone to cold cracks. The use of larger welding heat energy can reduce the hardening tendency, but due to the large hardening tendency of this steel...

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Abstract

The invention relates to a welding process of ASTM A572 GR65 steel, which adopts mixed gas protection welding of argon and carbon dioxide for carrying out the backing welding and adopts the mixed gas protection welding of argon and carbon dioxide for filling and cover surface welding under the operating environment with temperature above 5 DEG C, and the operation is carried out according to the following steps: (1) the determination of parameters of the welding process; (2) the preparation before the welding: groove preparation and contra-aperture assembly; (3) the requirements of the assembly of the tack welding; (4) the backing welding by the mixed gas protection welding of argon and carbon dioxide; (5) the filling and the cover surface welding by the mixed gas protection welding of argon and carbon dioxide. The invention provides the welding process of the ASTM A572 GR65 steel which can prevent the welded steel pipes generating low-plastic quenched structure, prevent the overheating during the austenitic transformation, strengthen the austenitic stability and lower the welding deformation which is reduced by the welding stress.

Description

technical field [0001] The invention relates to steel welding technology, in particular to a welding technology of ASTM A572 GR65 steel. Background technique [0002] With the rapid development of the power industry, high-strength steel is brewing for large-scale promotion and application. Traditional structural steel such as Q235 and Q345 are no longer suitable for some important projects or parts. Relevant design and research institutions attach great importance to the application of high-strength steel, but due to the difficulty of its production and welding, major design institutes dare not use it lightly. Since the comprehensive advantages and economic value of high-strength steel determine its broad prospects, the use of this project is an experimental development and application of the Design Institute. [0003] ASMTA572 GR.65 steel is the standard steel grade of the American Iron and Steel Institute, corresponding to China's low-alloy high-strength steel Q450. Its ...

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Application Information

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IPC IPC(8): B23K9/173B23K9/235B23K9/095
Inventor 戴刚平王淑红张国勋张再新包镇回
Owner ZHEJIANG SHENGDA STEEL TOWER
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