| 摘要 |
Disclosed is a method to test causticity at welded area of a stainless steel. In the method, a test piece(2) is manufactured by arc welding. The test piece(2) is heated in a nitric acid of 60 to the extent of 80 %, and the removed area by the causticity is measured. Next, a stretch test is performed by 0.5 to the extent of 5.0 mm/min of stretch speed, and measure a maximum stretch stiffness and a stretch ratio. Next, the maximum stretch stiffness and a stretch ratio are compared with those of an unheated piece. Thereby, the causticity at welded area of the stainless steel is accurately acquired.
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