TIG welding is stronger than MIG for many reasons.
MIG (metal inert gas) is a type of arc welding. During the process, an electrode is fed through a welding gun and into the joint that is being welded. The welding gun then releases an electric arc to melt the electrode and the metals that are being welded. The metal inert gas acts as a shield to protect the joints from contamination.
MIG welding is actually two different types of welding. The first uses bare wire, and the second flux core. Bare wire MIG welding can be used to join thin pieces of metal together. Flux core MIG welding can be used outdoors because it does not require a flow meter or gas supply. MIG welder or MIG welding is more tolerant than other processes, making it easier to learn. It also offers the highest deposition rate of all welding processes, allowing you to make welds at fast travel speeds.
TIG (tungsten inert gas) or TIG welder, on the other hand, uses a tungsten electrode instead of a consumable one. TIG welding also uses a shielding gas, but it can be used without filler material, unlike MIG welding.
Compared to MIG, TIG welding is better for more delicate work because of its higher levels of precision and control over heat input. TIG also has less spatter and post-weld cleanup than MIG because it uses no filler materials and has better shielding capabilities. It’s also more precise and provides greater control over the weld than other welding methods, allowing for stronger, higher-quality welds. TIG requires two hands though – one hand holds the torch while the other feeds filler metal into the weld puddle – so it’s slower than MIG or stick welding.
The strength of a weld is determined by the weld metal and not the type of welding.
The weld metal is the material deposited during the welding process. The weld metal is what is tested when tensile tests are done on welds. Weld metals have a chemical composition, microstructure, yield strength, and tensile strength that are different from base metals and filler metals.
The properties of a weld metal change based on whether it was deposited by TIG or MIG welding. For example, in steel alloys, TIG welding produces higher yield and tensile strengths than MIG welding. However, for other types of metals, such as aluminum alloys, MIG welding may produce stronger welds than TIG welding.
Properties of a weld metal are dependent on:
Chemical Composition: The chemical composition of the base metal, filler metal, and any heat treatment applied to the base materials/filler materials before or during the welding process will affect the resulting chemical composition of the weld metal.
Microstructure: The cooling rate experienced by molten or semi-molten material during solidification will determine its resulting microstructure (e.g., austenite or martensite). Faster cooling rates give rise to higher hardness levels.
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