1. The power supply with vertical characteristics is used, and the positive polarity (welding wire is connected to the negative pole) during DC.
2. Stainless steel steel pipes are generally suitable for welding of thin plates below 6mm. It has the characteristics of welding seams and small welding deformation
3. Protect the gas as a ghost, with a purity of 99.99%. When the welding current is 50 ~ 50A, the pyrine flow is 8 ~ 0L/min, and when the current is 50 ~ 250A, the pyrine flow is 2 ~ 5L/min.
4. The length of the protruding tungsten pole from the gas nozzle is 4 ~ 5mm. It is 2 ~ 3mm in the place where the coverability of angle welding is 5 ~ 6mm. More than 5mm.
5. In order to prevent the emergence of welding air holes, the welding site must be cleaned out if there are rust and oil pollution.
6. Welded arc length. When welding ordinary steel, it is better to be 2 ~ 4mm. When welding stainless steel, it is ~ 3mm.
7. When docking the bottom, to prevent the back of the bottom welding channel from being oxidized, gas protection is also required on the back.
8. In order to protect the welding pond well and facilitate welding operations, the tungsten polar center line and welding workpiece should generally maintain 80 ~ 85 ° angle, and the angle of the welding wire and the surface of the workpiece should be as small as possible. Generally, it is about 0 °.
The spiral steel pipe has high strength and stiffness. Due to its special structure, the spiral steel pipe can withstand greater pressure and weight, and has a high bending ability. This allows spiral steel pipes to assume important structural role in large buildings and bridges.
The spiral steel pipe has good corrosion resistance. The surface of the spiral steel pipe is treated by galvanized or spraying, which can effectively prevent contact between steel pipes with the external environment, thereby reducing the possibility of corrosion.
The spiral steel pipe has good sealing performance. The connection method of the spiral steel pipe uses a threaded connection or welding connection, which can ensure the sealing of the pipeline. This allows the spiral steel pipe to effectively prevent leakage when transporting liquid or gas, and ensuring the safe operation of the pipeline.
