What Materials Are Suitable for Mig Welding
Metal Inert Gas (MIG) welding process is an arc welding way that makes use of a continuous solid wire electrode heated and inserted into the weld pool with the help of a welding gun. The two foundation materials are melted at the same time to form a join. The gun consumes a shielding gas along with the electrode helping protect the weld pool from airborne pollutants. MIG welding process is a common welding process for learners. This process can be semi-automatic or automatic. Metal Inert Gas (MIG) welding was initially invented in the USA in 1949 for welding aluminum. The arc and weld pool developed using a stark wire electrode was covered by helium gas, easily available at that time. After 1952, the MIG welding process turns out to be more popular in the UK welding aluminum using argon gas as the shielding gas, and for carbon steels using CO2. CO2 and argon-CO2 combinations are called metal active gas (MAG) processes. MIG is one of the alternatives to MMA which offers high deposition rates and high productivity.
MIG welding is a flexible technique appropriate for both thin sheet and thick section components. An arc is smacked between one end of a wire electrode to the workpiece, melting both to form a weld pool. The wire serves as a heat source. The wire is fed via a copper contact tube which manages welding current into the wire. The weld pool is shielded from the surrounding environment by a shielding gas fed via a nozzle surrounding the wire. The selection of shielding gas depends on the substance being welded and the application. The wire is fed from a cylinder by a motor drive, and the welder (person performing the welding) moves the welding torch beside the joint line. Wires may be simple wires or core which is formed from a metal sheath with a crushed flux or metal filling. Consumables are usually competitively priced as compared to the other processes. This process presents high productivity, as the wire is constantly fed. Manual MIG welding is usually known as a semi-automatic welding process where the wire supply rate and arc length are monitored by the power source, but the wire position and travel speed are under manual control. When all the processes are not directly handled by a welder, this process can also be automatic but might require manual adjustment during welding. When no manual interference is needed during welding by the welder the process can be referred to as automatic. This process generally operates with the wire completely charged and connected to a power source supplying a constant voltage. The choice of wire diameter is between 0.6 and 1.6mm and the wire delivered speed identifies the welding current, as the burn-off rate of the wire will produce equilibrium with the supplied speed.
The most excellent metals for welding totally depend upon the customer requirements, design, budget, how skilled and experienced the welder is, and the process of welding to be used. Mostly all the metal can be welded, but the difference is only that some are easier than others for producing a high-quality, defect-free weld. There are some types of metal which require special apparatus, such as a vacuum or gas compartment, some machine to put limits on heat exposure, or pre-and post-welding heat treatment. There is some material which performs better with different types of welding, whether TIG, stick or MIG. Selecting the right choice of electrode and filler material for the bottom metal followed by prescribed welding procedures is important. Every situation and welding type depends on the base metal’s selection. Every welding process has a distinctive energy source which produces fusion between the base materials. Since every metal always has different melting points and unit structures, so they usually have better compatibility with some welding techniques than others.
ALUMINUM: With Aluminium the most suitable welding techniques are SMAW, AC-TIG, MIG
Producing a defect-free weld in aluminium is different from welding steel but can be achieved by following the recommended guidelines. Grades of aluminium that fall in the 1XXX and 6XXX series can undergo different welding processes. A 1XXX series aluminium does not need much extra effort of welder during the welding process which makes it simple to handle. On the other hand, if a welder uses proper welding and filler material then they can work with 6XXX aluminium. So, choosing the proper grade is one of the important steps while welding aluminium. Since aluminium has high thermal conductivity, heat is transported from the weld very quickly. To supply the required heat apparatus with a higher welding current may be needed. When aluminium cools, it shrinks drastically more than steel, so some special care must be taken to prevent the weld from craters and cracking.
STEEL AND STAINLESS STEEL: With Stainless steel and steel the most suitable welding techniques are SMAW, DC-TIG, MIG, FCAW.
Iron-based metals like stainless steel and steel have a tendency to work with the maximum number of processes compared to others. Low carbon moderate steel functions as one of the most weldable metals existing whose composition has low amounts of components that can reduce the risk of a failed weld. Stainless steel usually has a more complicated chemical composition, but it can also work with multiple processes. Depending on the grade, stainless steel can be weldable. Austenitic and Ferritic stainless steels can be welded easily, but not martensitic stainless-steel types, which tend to crack. Stainless-steel manages to bend under high heat, which in turn can affect the shape and strength of the final piece.
All the welding process requires specialized techniques and understanding of weldable metals. Accugroup has different automatic, semi-automatic and manual welding services a part of our metal fabrication solutions. Our specialized team makes use of MIG, TIG and spot welding to work with a variety of metals for different customers as per their requirements. For more details about welding services and different other services from Accugroup, you can contact us.