Analysis of stainless steel welded pipe process

Automatic welding welding and manual welding, automatic welding generally uses submerged arc welding, plasma welding, manual welding generally uses argon arc welding.
Although the production process of stainless steel welded pipe is simple, but also has the necessary process. The following torch will analyze the stainless steel welded pipe process for you: 1:
1, stainless steel welded pipe online bright solution treatment
Welded pipe in the production process due to rolling, stretching and welding at high temperatures, the material organization, mechanical properties are subject to change, seriously affecting the quality of the pipe, these changes are mainly: cold hardening phenomenon, that is, the crystal in a column or if more than a column of atoms occur in a regular misalignment, lattice distortion, the formation of a stress concentration zone, this phenomenon is also known as dislocation. Because of high temperature and uneven cooling welding stress and ferrite in the original single austenite organization, carbide and other uneven organization, in order to improve production efficiency, to ensure that the surface of the welded pipe bright, eliminate residual stress, a single austenite organization, the production of high-quality welded pipe, must be implemented online bright solution treatment method.
2, the impact of stainless steel welded pipe protective atmosphere
The use of liquid ammonia decomposition gas as a protective atmosphere, liquid ammonia at 400 ℃ above the following decomposition reaction: 2NH3 → 3H2 + N2. hydrogen is a reducing gas, under certain conditions can make some metal reduction, nitrogen is a neutral gas. With liquid ammonia decomposition atmosphere as a protective gas, stainless steel coil can make the surface of the welded tube white and smooth, so it is an economic and ideal protective gas.
3, stainless steel welded tube solid solution treatment temperature
Solid solution treatment temperature is one of the important parameters of the solid-liquid treatment process, too high or too low will directly affect the quality of the welded tube, the temperature is too high welded tube organization coarsening, performance decline, the temperature is too low solid solution is not complete, stress relief is not enough, choose 1080 ℃ ± 10 ℃, and appropriate insulation, carbide to get fully dissolved.