It started with the rise of bicycle manufacturing. The development of petroleum in the early 19th century, the manufacture of ships, boilers, and aircraft during the two world wars, the manufacture of thermal power boilers after the Second World War, the development of the chemical industry, and the drilling and transportation of petroleum and natural gas have all strongly promoted. The development of the steel pipe industry in terms of variety, output, and quality.
1. Use a power supply with vertical external characteristics, and use positive polarity when direct current (welding wire is connected to the negative electrode).
2. Generally suitable for welding thin plates below 6mm, with the characteristics of beautiful welding seam shape and small welding deformation.
3. The shielding gas is argon with a purity of 99.99%. When the welding current is 50~50A, the argon flow is 8~0L/min, when the current is 50~250A, the argon flow is 2~5L/min.
4. The protruding length of the tungsten electrode from the gas nozzle is preferably 4~5mm, 2~3mm for fillet welding, and other places with poor shielding, and 5~6mm for deep grooves. The distance from the nozzle to the work is generally not More than 5mm.
5. To prevent the appearance of welding pores, if there are rust and oil stains on the welding part, it must be cleaned up.
6. For welding arc length, 2~4mm is better when welding ordinary steel, and ~3mm is better when welding stainless steel. If it is too long, the protection effect will not be good.
7. To prevent the back surface of the bottom weld bead from being oxidized, the back surface also needs to be protected by gas.
8. To make the argon gas well protect the welding pool and facilitate the welding operation, the centerline of the tungsten electrode and the welding workpiece should generally maintain an angle of 80~85°, and the angle between the filler wire and the surface of the workpiece should be as small as possible. Generally, it is about 0°.
9. Windproof and ventilation. In windy places, please take measures to block the net, while indoors, you should take appropriate ventilation measures.
Post time: Nov-28-2023