Which welding type is known for producing the least distortion?

TIG welding is recognized for producing the least distortion among various welding processes due to several factors intrinsic to its operation. One of the primary advantages of TIG (Tungsten Inert Gas) welding is its ability to provide precise heat control. The process uses a non-consumable tungsten electrode, which allows the welder to focus the heat very narrowly on the workpieces.

This focused heat application results in lower heat input into the material, which minimizes the thermal expansion and contraction that typically leads to distortion. TIG welding also typically produces a smaller heat-affected zone (HAZ) compared to other methods, further contributing to reduced distortion. Additionally, since TIG welding can be performed using a filler material at the welder's discretion, it's easier to manage the amount of added material and thereby further control the distortion.

In comparison, other welding methods, while effective for various applications, tend to introduce more heat and can cause larger thermal effects, leading to more significant distortion in the base metal during and after the welding process.