Which Welding Process Should You Choose: TIG Welding or MIG Welding?

The ongoing debate of MIG versus TIG welding has long existed. Each side claims its process to be superior, but the truth is that both are correct. MIG welding is optimal for MIG-specific jobs, while TIG welding provides superior fusion for TIG projects that MIG cannot match.

So, how do you determine which process to use? This article provides a comprehensive breakdown of the advantages of each process and when to utilize them. While the concepts are easy to comprehend, it is critical to use the appropriate welding technique for each task to guarantee the best possible outcome.

Overview of MIG vs TIG Welding：

MIG and TIG welding involves utilizing an electric arc to generate heat and fuse two metal pieces, resulting in a molten puddle between them. As the weld pool cools and solidifies, the two pieces of metal become one.

To assist in holding the metals together, filler wire is fed into the molten puddle during the welding process. Additionally, gas is necessary to protect the liquid metal from external impurities. When contaminants, such as air, infiltrate the weld, bubbles can form, and the weld may not have the same strength and durability.

MIG Welding Overview: MIG welding employs a wire feeder that automatically dispenses wire from a spool through a lead and out of a gun nozzle. An electric current runs through the filler wire and generates an arc as it contacts the metal being welded.

The gun features a trigger that activates the current and dispenses the wire and shielding gas. This technique is simple since everything occurs with a single trigger press.

Machine settings can be adjusted and, in some cases, linked to the gun to allow for modifications during welding. Once the welder is set up for a specific job, it becomes as straightforward as point and shoot, focusing on moving speed and weaving pattern.

Pros:

• Automatic wire feed
• Fast welding process
• Easy to master
• Cost-effective
• Requires less cleaning

Cons:

• Less weld quality
• Less penetration
• Low aesthetics
• Difficult to seal with

TIG Welding Overview: TIG welding employs a stationary tungsten rod that resides within a torch. The arc is produced between the tungsten rod and the metal being fused, and the welder manually feeds the filler wire into the weld pool. While gas flows from the torch around the arc in a similar way to MIG welding, TIG welding usually employs a distinct type of gas.

Compared to MIG welding, the TIG arc is typically more focused, resulting in a smaller heat-affected area. This leads to deeper penetration and the ability to create finer welds, but the process is generally slower. The reduced speed is due to the necessity of hand-feeding the filler wire into the weld pool.