| 摘要 |
PURPOSE:To prevent the solidification clacking and sigma embrittleness of the titled steel used at the elevated temp. by increasing the ferrite deposition amt. of the root pass of weld metal, decreasing the quantity of weld heat input and decreasing the ferrite deposition amt. of the 2nd and subsequent passes. CONSTITUTION:The materials 2A, 2B to be welded are matched of a groove, and such a welding material wherein the ferrite amt. is contained at 2-5wt% in the austenite matrix is used for a root pass 4. The quantity of the heat input at the welding is limited to <=15kJ/cm. Next, in welding the 2nd and subsequent passes, such a welding material wherein the ferrite amt. is <=2wt% is used. The weld zone of the materials 2A, 2B of the austenitic stainless steel welded in this way is reduced of the solidification cracking sensitivity by the weld zone 4 of the root pass and is prevented of the sigma embrittleness by the 2nd 6 and the subsequent passes. |
