Weldclass WeldForce WF-255MST, Operating Instructions Manual

Page: 51 / 80

WF-255
MST
© Weldclass 2019 | E.&O.E. | Edition 2.2 51
11.9.4 How to determine correct Wire Speed/Voltage Setting
If the Current/Amperage (Wire Speed) is too high for the welding voltage, “stubbing” will occur as the
wire dips into the molten pool and does not melt. Welding in these conditions normally produces a poor
weld due to lack of fusion.
If, however, the welding voltage is too high, large drops will form on the end of the wire, causing spatter.
The correct setting of voltage and Current (Wire Speed) can be seen in the shape of the weld deposit
and heard by a smooth regular arc sound.
11.10 Suggested Settings for Typical MIG Applications
Material Wire Type
Shielding
Gas Wire
Size
Weld Position
Amperage
Range Voltage
Range
Mild Steel
Solid Mild Steel
Weldclass XT6
(E70S-6)
Argon +
CO
2
Mix
0.6mm All 40 – 60 17 – 18
0.8mm All 50 – 80 18 – 20
0.9mm All 60 – 220 16 – 22
1.2mm All 120 – 350 15 – 23
Gasless Flux-cored
Mild Steel
Weldclass GL-11
(E71T-11)
Not
required
0.8mm
Horizontal 90 – 150 14 – 16
Vertical & Overhead 60 – 125 10 – 12
0.9mm
Horizontal 80 – 200 12 – 17
Vertical & Overhead 70 – 150 12 – 15
1.2mm
Horizontal 160 – 220 16 – 18
Vertical & Overhead 120 – 180 16 – 18
Stainless
Steel Stainless Steel
316L Argon or
Mix
0.8mm All 60 – 125 17 – 22
0.9mm All 75 – 160 17 – 22
Aluminium Aluminium (5356) Argon
1.0mm All 110 – 200 19 – 22
1.2mm All 130 – 250 22 – 28
Table 12
These settings are a guide only. Actual settings required will depend on plate thickness, operator technique,
environment, etc.
11.11 Welding wire Size Selection
The choice of Welding wire size and shielding gas used depends on the following:
1. Thickness of the metal to be welded
2. Type of joint
3. Capacity of the wire feed unit and power source
4. The amount of penetration required
5. The deposition rate required
6. The bead profile desired
7. The position of welding
8. Cost of the wire
9. Environment (can shielding gas be used or not?)