styles of MIG welding torches
Welding torch and welding wire are chosen according to the welding machine, the metals to be welded and the welding needs.
To better understand the difference between bare wire and flux-cored wire, torches, wieldable steels and know how to constitute a welding kit mixing nozzle, rollers and spring, follow the expert!
• Welding torch
• Welding wire
• Type of metals to be welded
MIG welding: welding torch
The gas metal arc welding (Metal Inert Gas or Active) is a semi-automatic welding process using gas (argon, helium, or CO 2) for protecting the weld from corrosion.
The reel of the soldering station loaded with a coil carries the wire which has both a function of filler metal and electrode up to the torch to be melted.
An electric arc is caused in contact with the parts to be welded; the semi-auto welding is in action.
How A Mig Welder Works / Repairs
The welding torch must match the welding machine.
The welding torch must match the performance of the welding machine.
The MIG gun is characterized by its ergonomics, but also the adaptability of accessories and consumables in relation to the section of the wire used.
Craftsman, coachbuilder or amateur handyman, the universal standard for welding with solid wire from 0.6 mm to 1 mm and cored wire 0.9 mm will be perfect. This style makes it possible to carry out welding operations on thin steel. Although the torch must cover the mini and max range of welding objectives, it is best to choose a light and handy model.
The boilermaker, the carpenter and the welder will turn to more powerful torches allowing the passage of wire from 2 to 3 mm.
The ergonomics of the handles are different from one model to another. Try to determine which one is best for your welding position.
Criteria for selecting a mig welding torch
There are two main types of torches:
• the air-cooled torch (protective gas);
• The water-cooled or refrigerant- cooled torch in a closed circuit.
The air-cooled torch (protective gas)
This is the most common mig torch, from basic model to sophisticated model. The selection criteria are:
• the intensity of the welding current (150 A to 350 A);
• the length of sheath (3 to 4 m);
• the trigger type;
• the robustness of the accessories and their availability in supply;
• the range of use of the filler wires;
• the design of the handle and its construction materials (long or rotating gooseneck), with a spiral reinforcement to prevent twisting of the pipe;
• type of connector (usually European standard);
• The duty factor (60% maximum is the norm for this range).
The water cooled welding torch
The main features of the water cooled torch are:
• welding intensity up to 500 A (depending on job performance);
• 100% duty cycle;
• Closed circuit cooling system (refrigerated liquid).
Other more sophisticated torches
The water cooled torch with controls incorporated in the handle
In this matter, here we are in the presence of the Ferrari torches! Characteristics:
• the handle has a display of the speed and tension of the thread ;
• controls allow you to adjust these settings with the touch of a finger;
• the selection of welding programs is also possible at this level;
• Wire capacity 1.6 mm max.
The suction torch (from 150 to 500 A)
On this variant of torch, the gooseneck has gills to capture the welding fumes and return them to a vacuum filter unit. Real technological gem, perfect for intensive work. For once, the health of the welder is at the heart of the concerns!
The beam of a torch can be lengthened, but remember that the friction of the wire in the sheath may increase causing more or less serious problems after a certain period of use .
MIG welding: welding kit
In order not to fall into the trap of the consumables that are missing in the middle of your welding project, build a small stock of spare parts and consumables for a guarantee of your job completion.
The essential MIG torch parts
First of all, it is important to plan the material according to the wire used. Then make sure you have:
• Wire reel rollers with appropriate grooves are to be provided with the “torch batch” (they are present at the exit of the reel and tributary of the section of the wire);
• gas nozzles ;
• nozzle holding spring ;
• gas diffuser ;
• Contact tips (this consumable gets very hot as a result is the most requested).
Note: theses consumables are frequently sold in KITs .
Remember to spray separation anti – stick that will save these consumables. Spray on the gas nozzle prevents burning and adhesion of weld spatter. Projected in a fine and uniform way on the metal before welding, it also makes it possible to obtain a very effective lubricating film which will avoid you the task of cleaning the unwanted welding droplets: still an additional saving of time!
MIG welding: welding wire
In a MIG MAG welding machine, there is no electrode; the solder wire present as a coil in the reel replaces it and serves both arc contact and filler metal. Its permanent fusion forms the joint between the parts to be welded.
Types of wire
Two types of wires are distinguished:
• the bare or solid wire , associated with the code G , which requires the addition of a gas for its fusion;
• the flux- cored wire associated with the T code , has a flux of protection of melt which makes it possible to weld without gas even outside.
Grades of wieldable steels
• Carbon steel
• Alloy steel
• Stainless steel
• Steels reloading
Diameter, material and use of MIG welding wire