Started in the rise of the bicycle manufacturing. Oil was developed at the beginning of the 19th century, ships, boilers, during world war ii aircraft manufacturing, chemical industry and the development of oil and gas drilling and transport and so on, have greatly promoted the steel scaffolding tube pipe industry shift on variety, quality and yield_.

1. The application of vertical external characteristic of power supply, dc when using normal polarity (wire cathode).
2. Usually only suitable for thin plate welding, under 6 mm with a small beautiful weld forming and welding deformation characteristics.
3. The protective gas for argon, the purity of 99.99%.When the welding current is 50 ~ 50 a, the argon gas flow is 8 ~ 0 l/min, when the current is 50 ~ 250 a, argon gas flow is 2 ~ 5 l/min.

4. The length of the tungsten electrode from the gas nozzle is prominent, for beautiful, with 4 ~ 5 mm, poor shelter place such as in the fillet weld is 2 ~ 3 mm, where the slot depth is 5 ~ 6 mm, nozzle distance to work is generally not more than 5 mm.
5. In order to prevent the welding porosity appear, MS pipe scaffolding welding parts such as rust, oil, etc. Be sure to clean up.
6. The welding arc length, welding of ordinary steel, with 2 ~ 4 mm is better, and when the welding stainless steel, it is beautiful ~ 3 mm, too long is bad protection effect.

7. Docking render, to prevent the bottom on the back of weld bead was oxidized, also need to implement gas protection on the back.
8. To make the argon gas protection welding molten pool, well and is easy to welding operation, the center line of the tungsten electrode and welding work piece generally should maintain 80 ~ 80 ° Angle.