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Method for hot working and welding heavy plate

A welding method and technology for thick steel plates, applied in welding equipment, metal processing equipment, forming tools, etc., can solve problems such as the drop of weld impact, improve welding efficiency, solve easy cracks, and reduce construction period risks.

Active Publication Date: 2009-06-03
BEIJING URBAN CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a thick steel plate thermal processing and welding method, which mainly solves the welding problems of similar thick steel plates with a thickness of 80 to 165mm, and at the same time solves the problem of eliminating the welding stress of the welded workpiece of the thick plate, eliminating the cracks caused by welding, and avoiding the welding problem. Seam impact drop and other technical problems

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  • Method for hot working and welding heavy plate
  • Method for hot working and welding heavy plate
  • Method for hot working and welding heavy plate

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Embodiment Construction

[0040] Embodiment, taking Q460E-Z35 steel plate welding as an example, the steps of this steel plate thermal processing and welding method are as follows:

[0041] Step 1 see figure 1 , in the area of ​​at least 75mm on both sides of the cutting line 3 of the 80-165mm thick steel plate, the front heating plate 6 and the back heating plate 7 are used to preheat before cutting, and the preheating temperature must reach above 150°C; The thermometer monitors the preheating temperature, and the temperature measurement points are set at 75mm on both sides of the original edge of the weld.

[0042] Step 2 see figure 2 , when the preheating temperature reaches above 150°C, use the cutting machine 5 to cut the thick steel plate, and use a flame cutting gun to cut out the weld bevel 4 on the thick steel plate; the weld bevel is oblique Y-shaped or V-shaped, and the bevel The angle is 35°~40°, and the groove gap is 6~11mm.

[0043] Step 3 see image 3 , after the weld groove of the...

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Abstract

A heating and welding technology for the thick steel plate (80-165 mm in thickness) includes such steps as pre-heating the position to be welded to more than 150 deg.C by heating plates, cutting to form the groove as weld seam, thermal correcting at 640 deg.C for 20 min, cooling in air, removing the quenched layer from said groove, pre-heating to more than 150 deg.C by heating plates, welding, heat treating at 250-300 deg.C for 2 hr, and slow cooling.

Description

(1) Technical field [0001] The invention relates to a welding method, in particular to a thermal processing and welding method for 80-165mm thick steel plates. (2) Background technology [0002] With the development of architectural steel structure design and construction technology, the structural span of architectural steel structure engineering has become larger and larger, and the stress on nodes has become more and more complex, resulting in the extensive use of high-strength and extra-thick steel plates. Due to the large span and complex structure of the steel structure project of the National Stadium, 100 / 110mm thick Q460E-Z35 grade steel was partially used in the design. However, there is no relevant welding method for the welding of this Q460E-Z35 steel plate and thick steel plates of the same level. If the traditional thinner plate welding method is used, the welding residual stress and welding cracks cannot be effectively controlled, so the impact toughness of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P17/00B23P23/00B23D33/00B21D1/00B21D37/16B23K9/02B23K9/095B23K9/235B23K33/00C21D9/50C21D11/00
Inventor 李久林高树栋邱德隆
Owner BEIJING URBAN CONSTR GROUP