"ERW welded steel pipe" is a straight seam resistance welded pipe, abbreviated as ERW. It is used to transport vapor and liquid objects such as oil and natural gas and can meet various requirements of high and low pressure. It currently plays a decisive role in the field of transportation pipes in the world.

1. Ordinary welded steel pipes refer to ordinary "submerged arc welded steel pipes", which are represented by "SC" in electrical engineering. They can be used as water and gas pipes or as threading pipes. They are relatively thick.

2. A pipe conduit is also a wire conduit. It is relatively thin and is represented by "T". It can only be used as a threading conduit.

3. ERW steel pipe is a "high-frequency resistance welded steel pipe". It is different from the welding process of ordinary welded pipes. The weld is formed by melting the base material of the steel strip body, and its mechanical strength is better than that of ordinary welded pipes. ERW stands for resistance welding. Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automation. Therefore, it is an important welding process that is widely used in various industrial sectors such as energy, electronics, automobiles, and light industry.

Steel pipe argon arc welding machine is a machine that uses a high-voltage breakdown arc starting method for welding. Argon arc welding is tungsten inert gas-shielded arc welding. It refers to a welding method that uses industrial tungsten or active tungsten as a non-melting electrode and an inert gas (argon) as a shield. It is referred to as TIG. Commonly used for welding 6~10mm thick plates, double-sided and single-sided forming back cover welding of thick plates.

According to different electrodes, TIG welding machines can be divided into melting electrode TIG welding machines and non-melting electrode TIG welding machines.

1) Non-melting electrode TIG welding: Non-melting electrode TIG welding means that the arc burns between the non-melting electrode (usually a tungsten electrode) and the workpiece, and an inert gas (commonly used argon) flows around the welding arc. It does not react chemically with metals and forms a protective cover to prevent tungsten extremes, arcs, molten pools, and high-temperature metals from coming into contact with the air, preventing oxidation and absorption of harmful gases. This results in a dense welded joint with good mechanical properties.

2) Melting electrode argon arc welding: The welding wire is transported through a wire wheel, and the contact nozzle conducts electricity, generating an arc between the base metal and the welding wire, melting the welding wire and base metal, and using inert gas argon to protect the arc and molten metal for welding. Different from TIG welding, TIG welding uses welding wire as the electrode, which is then continuously melted, injected into the molten pool, and condensed into a weld. TIG welding uses shielding gas. As the TIG welding melts, With the application of technology, the protective gas has developed from a single argon gas to a large number of mixed gases. In terms of operating methods, semi-automatic argon arc welding, and argon-rich mixed gas shielded welding are the most widely used, followed by automatic argon arc welding.