304オーステナイトステンレス鋼溶接部のレーザ処理によるウエルドディケイの回復について

抄録

This experiment is attempted to find corrosion resistance improvements by Laser beam surfacing. The AISI 304 type stainless steel welds were surfaced by a 2 kW CO₂ Laser beam under several conditions. Laser surfaced specimens were evaluated under acidic corrosion tests and some metallurgical observations. This revealed that Laser surfacing resulted the changes in morphology of carbide precipitations in the HAZ of MIG welded joints. Following results were obtained from a series of experiments.
1) The MIG welded joints of AISI 304 type austenitic stainless are able to recover from the weld decay using Laser beam surfacing.
2) It is considered as the conditions for optimum Laser scanning being the partially melted ones. This case gave a 0.25 mm depth of solid solution treatment.