A device and process for removing residual stress of submerged arc tube welds by double-sided flame heating method

Abstract

The invention discloses a double-edge flame heating method submerged arc pipe welding line residual stress removal device and process. The device comprises a numerical control operation table, a lifting plate vertical transmission mechanism, a hoisting type connecting plate horizontal transmission mechanism, two sliding block symmetrical transmission mechanisms, two flame spraying guns, a submerged arc pipe conveying base and a base. The process includes the steps that firstly, according to the size of the diameter of a submerged arc pipe, adjusting buttons control the flame spraying guns and a welding line to keep a set vertical distance; secondly, according to the welding line zone area, the adjusting buttons control the horizontal distance of the flame spraying guns and the welding line, symmetrical heating of different positions of the welding line is achieved; and finally, according to the different positions of the two edges of the welding line, the mixing ratio of combustible gas including methane and oxygen is adjusted, and heating to the welding line area with different flame temperatures is achieved. The device and process are simple in structure, convenient to operate and high in adaptability, the temperature difference of the welding line in the circumferential direction is effectively reduced, residual stress of the welding line and a heat influence area is removed, and the submerged arc pipe welding line quality is improved.

Description

technical field [0001] The invention relates to the field of heat treatment of welded pipes, in particular to a device and a process for removing residual stress of a submerged arc pipe weld by a bilateral flame heating method. Background technique [0002] The deep-sea environment is very harsh and complex. Submarine pipelines, as transportation carriers, have long served in low-temperature, high-pressure, and highly corrosive marine environments. They not only bear the combined effects of internal and external pressure, axial force, bending moment, etc. Moreover, it must also bear the dynamic load of alternating external pressure, waves, and ocean currents, so that the pipeline is subjected to the combined action of various loads and causes various forms of damage. , maintenance, etc. have put forward higher requirements than those on land, and deep-sea oil and gas pipelines are developing in the direction of high and high strength. The residual stress on the weld is main...

AI Technical Summary

Problems solved by technology

But it is only for small-diameter steel pipe joint welds, and there are defects such as inability to adapt to submerged arc welded pipes of different specifications, adjustment of heating position and control of heating temperature, etc.

Images