Welding methods for seamless pipes should be selected based on the material and wall thickness of the pipes. Different welding methods possess varying arc heat and arc force, thus exhibiting distinct characteristics. For instance, tungsten inert gas (TIG) welding features low current density, stable arc combustion, and good weld bead formation, making it particularly suitable for thin plate welding but not for thick plates. Plasma arc welding, on the other hand, boasts 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, characterized by deep melting capability and high wire deposition efficiency, can significantly increase welding speed and reduce costs, although working conditions and environmental factors are relatively poor. 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 the seamless pipes is crucial for ensuring welding quality, improving productivity, and reducing costs.

Moreover, the type and magnitude of the welding current, the arc voltage, welding speed, and the welding material used all have a significant impact on 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 rationally.