1、Manual welding：Manual welding is a very common and easy-to-use welding method. The length of the arc is adjusted by human hands, and it depends on the size of the gap between the electrode and the workpiece. At the same time, when used as an arc carrier, the welding rod is also a weld filler material.

This welding method is very simple and can be used to weld almost all materials. For outdoor use, it has good adaptability, even if it is used underwater. Most electric welding machines can TIG welding. In electrode welding, the arc length is determined by the human hand: when you change the gap between the electrode and the workpiece, you also change the arc length. In most cases, direct current is used for welding, and the electrode serves as both the arc carrier and the weld filler. The electrode is composed of alloy or non-alloy metal core wire and electrode coating.

2、MIG/MAGwelding：This is an automatic gas shielded arc welding method. In this method, the arc is sintered between the current carrier wire and the workpiece under the shield of a protective gas. The wire fed by the machine acts as a welding rod and melts under its own arc. Due to the versatility and particularity of the MIG/MAG welding method, it is still the most widely used welding method in the world. It is used in steel, non-alloy steel, low-alloy steel and high-alloy-based materials. This makes it an ideal welding method for production and repair. When welding steel, MAG can meet the requirements of thin gauge steel plates only 0.6mm thick. The protective gas used here is an active gas, such as carbon dioxide or mixed gas. The only restriction is that when welding outdoors, the workpiece must be protected from moisture to maintain the effect of the gas.

3、TIG welding：The arc is generated between the refractory tungsten welding wire and the workpiece. The shielding gas used here is pure argon, and the incoming wire is not charged.

The welding wire can be sent by hand or mechanically. There are also some specific applications that do not require feeding wire. The material being welded determines whether to use direct current or alternating current. When using direct current, the tungsten welding wire is set as the negative electrode. Because of its deep penetration capability, it is suitable for different types of steel, but it does not have any "cleaning effect" on the weld pool.