Design and function
MIG/MAG welding
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099-005444-EW501
17.03.2015
5.10 MIG/MAG welding
5.10.1 Welding torch and workpiece line connection
On delivery, the central connector is fitted with a capillary tube for welding torches with spiral
guides. Conversion is necessary if a welding torch with a plastic core is used!
Welding torch with plastic core > use with guide tube!
Welding torch with spiral guide > use with capillary tube!
Depending on the wire electrode diameter or type, either a steel liner or plastic liner with the
correct inner diameter must be inserted in the torch!
Recommendation:
• Use a steel liner when welding hard, unalloyed wire electrodes (steel).
• Use a chrome nickel liner when welding hard, high-alloy wire electrodes (CrNi).
• Use a plastic core to weld or braze soft wire electrodes, high-alloy wire electrodes or aluminium
materials.
Preparation for connecting welding torches with a plastic core:
• Push forward the capillary tube on the wire feed side in the direction of the Euro torch connector and
remove it there.
• Insert the plastic liner guide tube from the Euro torch connector side.
• Carefully insert the welding torch connector with as yet too long plastic liner into the
Euro torch connector and secure with a crown nut.
• Cut off the plastic liner with a liner cutter- See 9 Accessories chapter just before the wire feed roller.
• Loosen the welding torch connector and remove.
• Carefully chamfer the cut off end of the plastic liner with a liner sharpener - See 9 Accessories chapter
and sharpen.
Some wire electrodes (e.g. self-shielding cored wire) are welded using negative polarity. In this
case, the welding current lead should be connected to the "-" welding current socket, and the
workpiece lead should be connected to the "+" welding current socket. Observe the information
from the electrode manufacturer!
Figure 5-9
