Mild Steel Welding Wire ( HTW-50) ( Export) Description: HTW-50 is a mild steel copper coated welding wire suitable for 100% CO2 and Argon & CO2 mixed gas protective welding with stable feadability, good welding seams, less spatters, and excellent welding process properties. Application: Used to welding high strength steel at 490 N/ mm2 grade, low electricity current, usually for steel below Q275 and steel 15 20.