MetFab - Air Products Welder's Handbook - Flipbook - Page 32
Root runs can be made by TIG or MIG/MAG
with dip or pulse welding and the tube or
pipe can be filled with a backing gas (see
page 21) or backing strip.
Unbacked butt joint
Flange joints are either fillet or butt welded.
Fillet
Butt
Uniform root gap
The edge preparation can be chosen
in accordance with the guidance table
on page 24.
Backed butt joint
When welding flanges, for ease and
productivity, the axis of the pipe should
be vertical and the flange rotated.
Backing strip
Flange rotated
28
