Steel structure mixed gas arc welding welding process

Abstract

The invention discloses a steel structure mixed gas arc welding welding process. The steel structure mixed gas arc welding welding process includes the following steps that grooves are formed according to the shapes and the welding positions of steel structures, impurities around the grooves are removed, the weld faces are wiped with sulfuric acid with the concentration of 0.5 mol / L, the weld faces are wiped with acetone after being washed, and the weld faces are naturally aired; the to-be-welded portions of the steel structures are in butt joint, the interval between the grooves is 0-2 mm, and fixation is conducted so as to prevent movement; gas arc welding is adopted for welding, corresponding process parameters are selected, low hydrogen type electrodes are selected for use, and the low hydrogen type electrodes are dried for 1-1.5 h at the temperature of 300-350 DEG C before being used, slowly cooled after being dried and placed in an insulation box at the temperature of 100-120 DEG C for use; in the welding process, pulse current is adopted for welding, multilayer multiway continuous welding is adopted, the steel structures are welded at a time, the interlayer temperature is controlled to range from 150 DEG C to 200 DEG C, and protective gas continues to flow in for 3-4 minutes after welding is finished. The steel structure mixed gas arc welding welding process is convenient to carry out, high in welding efficiency and low in welding defect occurrence rate.

Description

field of invention [0001] The invention relates to a welding process, in particular to a steel structure mixed gas shielded welding process. Background technique [0002] At present, China has become the world's largest steel producer and consumer, and steel structures are widely used in my country, such as factories, bridges, residences, warehouses, gymnasiums, exhibition halls, supermarkets and other buildings are widely using steel structures. The steel structure has good ductility, plasticity and toughness, and has excellent earthquake resistance and load bearing capacity, which greatly improves the safety and reliability of steel structure buildings. Steel structure buildings are light in weight, low in foundation cost and short in construction period, and have a strong competitive advantage in today's rising labor prices. In addition, the steel structure has a high degree of industrialization, a short manufacturing cycle, good precision control, and can meet the requi...

AI Technical Summary

Problems solved by technology

[0003] At present, the welding method of steel structure is mainly manual arc welding. Although it can realize the welding of specific fixed steel structure parts, the scope of work is limited, and it is difficult to realize efficient and fast welding of steel structure parts. In the case of no post-processing after welding, welding The generated pores and spatter cannot be effectively cleaned, and the quality of the weld cannot be guaranteed, which in turn affects the performance of the steel structure