Due to the varying arc heat and arc force of different welding methods, each possesses unique characteristics. For instance, Tungsten Inert Gas (TIG) welding is characterized by lower current density, stable arc combustion, and good weld bead formation, making it particularly suitable for thin plate welding. It is not suitable for thick plate welding. Plasma arc welding features high arc column temperature, high energy density, and good straightness, with a wide range of rigidity and flexibility, and stable operation, although it is more complex to operate. Submerged Arc Welding, on the other hand, boasts deep penetration and high wire feeding efficiency, significantly increasing welding speed and reducing costs, albeit with less favorable working conditions and environment. It is evident that different welding methods have varying capabilities and operational costs. Selecting the appropriate welding method based on the material and wall thickness of seamless pipes is crucial for ensuring welding quality, improving productivity, and reducing costs.

Additionally, the type and magnitude of the welding current, the arc voltage, welding speed, and the welding material used all significantly affect the arc heat and arc force. Therefore, different welding methods are only suitable for welding different materials and varying thicknesses. The key lies in selecting the appropriate welding method.