Linde BOC RAPTOR 160 MIG Operating Manual page 23

Cast and Helix
Cast
Cast – Diameter of the circle
Helix – Vertical height
weldmetal. Solid MIG/MAG wires are all considered
to be of the 'low Hydrogen type' consumables.
The following table gives a general overview of the
selection of some of the BOC range of MIG/MAG
wires for the most common materials.
Common Materials Welded with BOC MIG Wire
Material
AS2074 C1,C2,C3,C4-1,
C4-2,C5,C6
AS/NZS1163 C250
AS/NZS3678
200,250,300
ASTM A36,A106
Stainless Steel
Grade 304/L
Grade 309
Grade 316/L
Physical condition
Surface condition
The welding wire must be free from any surface
contamination including mechanical damage such
as scratch marks.
A simple test for checking the surface condition
is to run the wire through a cloth that has been
dampened with acetone for 20 secs. If a black
Helix
BOC MIG Wire
BOC Mild Steel MIG Wire
BOC Mild Steel MIG Wire
BOC Mild Steel MIG Wire
BOC Mild Steel MIG Wire
BOC Stainless Steel
308LSi
BOC Stainless Steel
309LSi
BOC Stainless Steel
316LSi
residue is found on the cloth the surface of the
wire is not properly cleaned.
Cast and Helix
The cast and helix of the wire has a major influence
on the feedability of MIG/MAG wire.
If the cast is too large the wire will move in an
upward direction from the tip when welding and if
too small the wire will dip down from the tip. The
result of this is excessive tip wear and increased
wear in the liners.
If the helix is too large the wire will leave the tip
with a corkscrew effect.
Selection of the Correct Power Source
Power sources for MIG/MAG welding is selected on
a number of different criteria, including:
1 Maximum output of the machine
2 Duty cycle
3 Output control (voltage selection, wire feed
speed control)
4 Portability
The following table gives an indication of the
operating amperage for different size wires.
Wire Size
0.8 mm
0.9 mm
1.0 mm
1.2 mm
Amperage Range (A)
60–180
70–250
90–280
120–340
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