Non-preheating combined welding method of 1200MPa high-strength steel

Abstract

The invention provides a non-preheating combined welding method of 1200MPa high-strength steel. The non-preheating combined welding method comprises the following steps: carrying out groove machining and preprocessing; adopting gas shielded welding to carry out backing weld, wherein welding wires are 500MPa welding wires; adopting carbon dioxide gas shielded welding which carries out mechanical automated welding wire filling to carry out filling welding, wherein the welding wires are 980MPa high-strength welding wires; carrying out carbon arc gouging back chipping; adopting mechanical automated wire filling non-melt argon shielded arc welding to carry out capping layer and end covering layer welding, wherein the welding wires are 560MPa high-strength welding wires. The combined welding method can reduce welding crack sensitivity, a welding line has attractive appearance, and the mechanical property of a welding joint is good. The mechanical automated combined welding technology has the advantages of simple processing step, convenience in operation, high practicality and good popularization and application prospect, production cost can be lowered, and production efficiency is improved.

Description

technical field [0001] The invention relates to a welding method for high-strength steel, in particular to a combined welding method for high-strength steel with a tensile strength of 1200MPa without preheating, and belongs to the field of welding technology. Background technique [0002] High-strength steel with a tensile strength of 1200MPa has attracted more and more attention due to its ultra-high strength, good plasticity and toughness, and can meet the development requirements of "high-end, high-tech, and high added value" in the field of construction machinery manufacturing. Welding technology is an important factor affecting the application of high-strength steel. The innovation of welding methods, welding materials and processes plays a vital role in the engineering application of high-strength steel with a tensile strength of 1200MPa. [0003] 1200MPa high-strength steel has high hardenability and a strong tendency to cold cracks. Defects such as cold cracks and br...

AI Technical Summary

Problems solved by technology

However, the welding process of pre-weld preheating and post-weld heat treatment is more complicated and the production cost is high, especially for large-scale welding engineering structural parts, pre-weld preheating and post-weld heat treatment increase the construction difficulty and production cost, and due to the influence of welding structure , sometimes preheating and post-weld heat treatment are difficult to achieve

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