MetFab - Air Products Welder's Handbook - Flipbook - Page 28
Welding of plate
Both TIG and MIG/MAG processes can be
used to weld plate material - this is typically
regarded as material which is over 3mm.
For plate up to 6mm thickness, the edges
can be cut square and for 6mm and over,
an edge preparation such as a single ‘v’ or
double ‘v’ (photo page 25) is required, which
calls for a larger weld. MIG/MAG welding,
or a combination of MIG/MAG welding
with a TIG welded root pass, are the most
commonly used techniques.
Spray transfer is highly productive and can
be used for butt joints in the flat position
and for T-joints in both flat (PA), and
horizontal/vertical (PB) positions.
Anglea
a,aa
Gapb
b
(mm)
Thickness of
root face c
(mm)
Up to 6mm
–
~t
–
t
4 - 12mm
40≤ a
≤ 60
≤4
≤2
5 - 40mm
a ≈ 60
1≤b≤4
2≤c≤4
t
Thickness
(t)
t
Recommended joint preparations for butt welds in carbon and stainless steels
b
b
c
a
b
24
c
a
