Adopt the power source with vertical external characteristics, and use the positive polarity (welding wire connected to the negative pole) when DC.
Stainless steel pipe is generally suitable for welding of thin plates below 6mm, with beautiful weld molding, welding deformation of small features
Protective gas is argon, purity is 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.
Tungsten electrode from the gas nozzle protrudes from the length of 4~5mm is good,, in the corner welding and other poorly shaded places is 2~3mm, in the grooving of deep places is 5~6mm, the nozzle to the work of the distance is generally not more than 5mm.
Welding electricity in order to prevent the emergence of welding porosity, welding parts such as rust, oil, etc. must be cleaned up.
Arc length, welding ordinary steel, to 2 ~ 4mm is good, and welding stainless steel, to ~ 3mm is good, too long is not good protection.
Butt bottoming, in order to prevent the back of the bottom welding channel is oxidized, the back also need to implement gas protection.
In order to make argon gas well protected welding pool, and facilitate the welding operation, tungsten pole centerline and welding at the workpiece should generally maintain 80 ~ 85 ° angle, filler wire and workpiece surface angle should be as small as possible, generally about 0 °.
Spiral steel pipe has high strength and rigidity. Due to its special structure, spiral steel pipe can withstand greater pressure and weight, and has high bending resistance. This enables spiral steel pipe to assume important structural roles in large-scale buildings and bridges and other projects.
Spiral steel pipe has good corrosion resistance. The surface of spiral steel pipe is galvanized or sprayed and other treatments, which can effectively prevent the steel pipe from contacting the external environment, thus reducing the possibility of corrosion.
Spiral steel pipe has good sealing performance. The connection of spiral steel pipe adopts threaded connection or welded connection, which can ensure the sealing of the pipe. This makes the spiral steel pipe can effectively prevent leakage when conveying liquids or gases, ensuring the safe operation of the pipeline.
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