Because TIG welded joints without filler wire always hold lowstrength and poor formation, tungsten inert gas welding process with filler wire is inevitable.
Low carbon steel for wire drawing has higher tensile strength in SGIS. The analysis showed that higher tensiles strength was mainly originated from the high content of Cu, As, Sn in steel.
The result shows that production of high strength screw bars is reasonable by the control rolling and control cooling process on high-speed wire mill with the capacity of low temperature rolling.