| 摘要 |
PURPOSE:To increase the high temp. crack resistance of a welding metal by welding an austenite group stainless steel by using the shielded gas adding N2 in Ar, He or Ar + He gas. CONSTITUTION:The stainless steel 1 of a base metal is welded with feeding a shielded gas 10 from a shielded gas nozzle 7 with feeding a welding wire 3 via a welding wire feeding roll 8. The shielded gas is fed after mixing uniformly by a mixer, etc. in advance 2-30% N2 in either Ar, He, or Ar + He inert gas. The welding head consisting of a welding torch 5 and shielded gas nozzle 7 is made in flat shape so as to come into a narrow groove. For melting sufficiently both sides of the groove the oscillating device by the magnetic deviation, etc. of the arc and the mechanism forming a bending habit to the wire 3 are installed. The high temp. crack resistance of the welding metal can thus be increased. |
