When a butt-welded joint is visually inspected for penetration,
发布于 2021-02-18 18:20:56
【单选题】 A the penetration should be 25 to 50 percent of the thickness of the base metal. B the penetration should be 100 percent of the thickness of the base metal. C look for evidence of excessive heat in the form of a very high bead.
