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Steel Interchange


CJP Groove Weld for HSS
When installing a backing bar on HSS that require an all-around complete-joint-penetration groove weld, should the backing bar be curved to follow the inside corner profile of the shape, or can four individual straight pieces be used?

Answer

Section 5.10.2 of AWS D1.1 requires that steel backing shall be made continuous for the full length of the weld, and that all joints in the steel backing shall be a CJP groove weld butt joint. This would preclude the use of segmented backer bars for the all around CJP groove weld.

 

Kurt Gustafson, S.E., P.E.

Posted on June 1, 2010


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