| Welding Method | Core Principle | Applications | Key Technical Requirements |
|---|---|---|---|
| TIG (AC) | Utilizes the ”cathodic cleaning” effect of AC to effectively break up and remove the oxide layer. The most versatile method. | Thin sheets, precision parts, all-position welding where weld appearance is critical. | Precise adjustment of AC balance (cleaning width) and AC frequency (arc concentration). Mastery of the “bright spot” initiation technique. |
| MIG | High productivity, suited for thicker plates and high-volume production. DCEP (wire positive) also provides cathodic cleaning. | Medium to thick plates, automated production lines, applications where welding speed is prioritized. | Requires larger diameter wires (e.g., 1.2mm or 1.6mm). Precise control of wire feed speed and welding current matching. |
| Friction Stir Welding (FSW) | Solid-state welding below the melting point, completely avoiding porosity, cracking, and element burn-off inherent in fusion welding. | Plates from 5mm to 120mm, especially structures demanding the highest quality (e.g., aerospace, high-speed rail manufacturing). | Requires specialized tools (stirring pin) and high-rigidity equipment with stringent fixturing and backing support. Primarily controls rotation speed, traverse speed, and axial force. |
Supplementary Note: Laser-arc hybrid welding combines the deep penetration of a laser with the gap tolerance of an arc. This rapidly developing high-efficiency process can reduce porosity by over 60% compared to MIG.
Post time: Jun-03-2026
