General Description
The MIG/MAG welding torch is the central hand tool in metal shielded gas welding (MIG = Metal Inert Gas, MAG = Metal Active Gas). Together with the cables and hoses, also called the hose package, it serves to supply welding wire, shielding gas, and electric current in a controlled manner to the welding point. The combination of these components generates the arc that melts the base material and the wire.
Construction of a MIG/MAG Welding Torch
A typical MIG-MAG hose package consists of the following main components:
Torch neck (torch tube):
Guides the welding wire, shielding gas, and current to the torch tip. The neck is usually slightly curved to allow an ergonomic working position.Contact tip:
Transfers the welding current to the wire. It is a wear part and must be regularly checked and replaced when worn.Gas nozzle:
Directs the shielding gas evenly around the arc and thus protects the weld area from oxygen.Contact tube and wire guide (wire liner):
The liner guides the welding wire from the wire feeder to the contact tip. It must be suitable for the respective wire diameter and wire type.Torch handle:
Contains the switch for controlling current and wire feed. Often ergonomically shaped and heat-resistant.Hose package:
Connects the torch to the welding machine. It contains lines for current, gas, and wire as well as, if applicable, cooling water (for water-cooled torches).Connection unit:
Serves to connect to the welding machine and ensures the supply of current, gas, and wire feed.
| 1 | Contact tip |
| 2 | Gas nozzle |
| 3 | Torch switch |
Functionality
When the torch switch is pressed, the welding current is switched on, the wire feed starts, and shielding gas is supplied.
The welding wire serves simultaneously as electrode and filler material. An arc forms between the wire and the workpiece, locally melting the material.
The shielding gas (e.g. argon, CO₂, or their mixtures) prevents oxidation and protects the weld seam from contamination.
Depending on the type of gas, the following are distinguished:
MIG welding: with inert gas (e.g. argon, helium) – for non-ferrous metals such as aluminium.
MAG welding: with active gas (e.g. CO₂, argon-CO₂ mixture) – for unalloyed and alloyed steels.
Care and Maintenance
Regular maintenance of the torch extends its service life and improves welding quality. Further information can be found in the article on care and maintenance of MIG-MAG torches
Safety Notice
Before maintenance work or nozzle changes, always switch off the torch and close the gas supply.
Warning: Torch parts can be sharp or hot. Risk of injury! Personal protective equipment (welding gloves, safety goggles, heat-resistant clothing) must always be worn.
RED MIG-MAG Welding Machines:
Would you like to learn more about the MIG / MAG welding process?
Here are the respective articles: