Steel tube butt joint process

Abstract

The invention belongs to the technical field of steel tube machining, and particularly relates to a steel tube butt joint process. The steel tube butt joint process comprises the following steps: liner manufacturing: preparing an annular liner with a step, wherein the height of the step of the annular liner is consistent to the difference between thicknesses of steel tube walls; groove preparation: preparing a welding groove by using groove chamfering equipment; positioning welding: assembling on an assembling rack, and carrying out positioning welding by using a flux-cored wire arc welding process; submerged arc welding: carrying out circumferential weld outside welding by single wire submerged arc welding; and nondestructively detecting weld joints. The annular liner with the step is adopted, cutting is implemented by a steel tube and a knife which simultaneously rotate at different speeds, a hobbing cutter seat is adopted, the angle of the seat is adjusted according to a chamferingratio, a chamfered groove is processed by integral linear feeding of a knife bit, stress distribution during butt joint of steel tubes with different wall thicknesses is relieved, the strength and toughness of a butt joint are improved, and performance deficiencies of a whole structural portion are reduced.

Description

technical field [0001] The invention belongs to the technical field of steel pipe processing, and in particular relates to a butt joint process of steel pipes, which is suitable for welding non-equal thickness steel pipes with outer diameters less than 1000 mm. Background technique [0002] The application field of submerged arc welding for pile structures continues to expand, and it is widely used in high-rise buildings, high-speed rail stations, light rail lines, port construction, wharves, bridges, power towers, offshore platforms and other fields. Based on the design requirements, special submerged arc welded steel pipes such as super long, different diameter and small diameter are also required by more and more customers. However, due to the limitations of steel pipe processing equipment, such steel pipes must be delivered by butt jointing. [0003] At present, the design and calculation of steel structures are gradually refined. According to the stress of different pa...

AI Technical Summary

Problems solved by technology

[0004] The steel pipe butt joint industry in China has developed relatively maturely, but there are relatively few studies on the joint length of different wall thicknesses, small diameters, and tapered pipes.