Could anybody help me with an idea for the width of ferrel (backing strip) to be used when welding pipe to AWS D1.1??
A practical example:
Welding a 452mm I/D pipe with 14mm wall thickness. Backing strip wall thickness 8mm.
Joint type = single V-groove (B-U2a-GF) with 45 degree incl. angle & 6mm root gap.
I suspect that this has more to do with the designer part of construction, but I'm just curious.
Thanx.