1 Production of small precision pipe inside burr:
An important aspect of product quality precision pipe is to remove the burr within the weld, due to space constraints by location, small diameter pipe within the burr removal has been a technical difficulty pipe manufacturing. Therefore, the appropriate choice of welding method from the welding technology is an effective way to solve the problem, a small glitch in the production of welding method with DC square wave welding method and a resistance welding method. The welding method is characterized by uniform heating, welds smooth, good quality and inner burr formation is very small, typically only 0.1 to 0.2 mm.
2 Micro-plasma production of extremely high-precision thin-walled pipe:
Micro-plasma welding method extremely thin-walled pipe, outside of the welds smooth and bright, dense inner weld formation, no burr height on average over .031 ~ 0.020㎜, post-weld pipe diameter ovality 0.10 to 0.23㎜ wall thickness difference of 0.020 ~ 0.034㎜, after cold rolling effectively eliminates the outer diameter of the ellipse through the large range of wall thickness difference reaches 0.002 to 0.007㎜, quality fully meet the level of precision seamless thin-walled tubes. After the heat treatment, it has the same organization and seamless performance, but with the economic advantages of seamless tube production welding thin tube much less than before the cold rolling process of thin tubes.
3 High-strength pipe automobile industry:
In recent years, domestic auto industry to implement lightweight cars, to save energy, the urgent need to replace parts of high-strength hollow solid components. Seamless alternative to meet the needs of the automotive industry to develop high-strength pipe is technically feasible. Japanese automobile industry in the development of high-strength pipe connection, have developed a C-Ti-B, C-Mn-Nb, C-Cr-AI-B steel and other series, and according to different purposes, different heat treatment system, such as annealing, normalizing and quenching, tempering. High strength steel pipe for the automotive industry, the standard strength levels are 561MPa, 637MPa, 980MPa and the like. In addition to requiring high strength-givers, for pipe also required to have a high plasticity, good workability, hardenability, toughness and fatigue strength.
