Welding method of thin-wall high-strength steel plate

Abstract

The invention relates to a welding method of a thin-wall high-strength steel plate. The welding method comprises the steps that 1) welding materials are selected, specifically consumable electrode gasshielded welding materials are adopted; 2) the preheating temperature is determined through a Y-groove cracking test, wherein the reference standard is CB / T4364-2013; 3) the steel plate is cut and blanking is performed; 4) groove machining is conducted, specifically, the cutting parts of base metal are polished to remove cracks or heat affected zones left after cutting, and then regular Y-shapedgrooves are machined in the two pieces of base metal, wherein the regular Y-shaped grooves are 60-degree grooves, and the truncated edges are 2 mm; 5) the base metal is preheated before welding, specifically, steel is preheated according to the preheating temperature determined in the step 2); 6) test pieces are spliced, specifically, a truncated edge gap is controlled to be 0-0.2 mm; 7) welding is conducted, specifically, the temperature of the base metal is uniformized through a cooling device, welding is conducted in a front-back face welding mode, back gouging is conducted thoroughly in acarbon arc gouging mode after front-face welding is completed, and then back-face welding is conducted; 8) postweld heat treatment is conducted, specifically, hydrogen elimination is conducted; and 9)flaw detection of a welded joint is performed. According to the welding method of the thin-wall high-strength steel plate, the problems that the thin-wall steel plate is prone to deformation in the welding process, and the heat affected zones are prone to softening when high heat input welding is adopted are solved.

Description

technical field [0001] The invention relates to a welding method of a thin-walled thick high-strength steel plate. Background technique [0002] High-strength steel plates are mainly used in the manufacture of large-scale mechanical equipment. Large-scale and lightweight construction machinery is the development trend. Under the same strength requirements, the thickness of high-strength steel plates is smaller. During welding, thin-walled steel plates will have more serious welding deformation than thicker plates, and as the strength of the steel plate increases, the welding line energy should not be too high. Excessively high welding line energy will cause softening of the heat-affected zone of steel plate welding , seriously reducing performance indicators such as strength and toughness of welded joints. [0003] Welding process involves groove preparation, selection of welding materials and welding process control, etc. Welding process control includes: preheating before...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a welding method for thin-walled high-strength steel plates in view of the above-mentioned prior art, to solve the problems that deformation of thin-walled thick steel plates is easy to occur during welding, and the heat-affected zone is easy to soften when welding with large heat input

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