Thickness range
Thickness range
(OP)
How to consider the thickness range of tee-joints in the light of Section IX. If I, for example, approve butt joint comprised of plates at the thickness of 6 mm, may I weld a plate of the same thickness to the other plate of 60 mm thick (6 mm plate is chamfered). If the thickness of the thicker elements should be taken into consideration?





RE: Thickness range
Your welding procedure specification needs to be qualified for a 60mm base metal thickness included, and the corresponding groove weld deposit thickness.
RE: Thickness range
BG
RE: Thickness range
If you still need some help, or don't have access to this info holler back.
RE: Thickness range
Correct. My response above was intended for base materials that were being joined as ferritic, in lieu of austenitic or non-ferrous. Per QW 202.4, if the dissimilar thickness material is NOT any of the following base metals; P-No 8, 41, 42, 43, 44, 45, 46,49,51,52,53,61, and 62
the base metal thickness of the weld coupon for weld procedure qualification must be 30mm, to qualify for a 60mm base metal thickness in production.
Otherwise, if the base metals being joined are either austenitic or non-ferrous, you only need to qualify on base metal 1/4" thick (minimum) or about 6.1 mm in thickness. The rationale being that austenitic and non-ferrous metals do not exhibit the same hardenability characteristics as ferritic steels, where thickness range must be qualified based on the need for weld preheat and post weld heat treatment.