| 摘要 |
PURPOSE:To improve the operation efficiency of welding and the welding characteristics, by removing the lubricant which has sticked to the wire rod for arc welding at the wire drawing by carrying out the pickling treatment for the above wire rod to which the wire drawing has been applied. CONSTITUTION:A the welding rod for arc welding with covered electrode and the filler metal for the TIG process, the MIG process, etc., the wire rod of pure Ni, alloy of Ni base, austenitic stainless steel, ferritic stainless steel, etc. is drawn. At this time, the lubricant consisting of Ca as the main component is used in order to pass smoothly the wire rod through the dies and this lubricant sticks to the wire rod in the form of minute wrinkles. As this lubricant degrades the operation efficiency of welding and the welding characteristics, the sticking lubricant is dissolved and removed by pickling the wire rod with nitric acid having a concentration of 20-50%. The operation efficiency of welding such as fuidity, occurring state of scale, etc. and the welding characteristics such as bending strength at the weld zone, state of wave form of arc voltage, etc., are improved sharply. |
