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Stainless Steel Pipe Welding Points And Precautions

Stainless steel pipe welding points and precautions
Stainless steel pipe welding need to know:
1. The use of vertical external power supply, DC with positive polarity (wire connected to the negative)
2. Generally suitable for welding below 6mm sheet, with weld appearance, welding deformation of small features
3. The shielding gas is argon and the purity is 99.99%. When the welding current is 50 ~ 50A, the argon flow rate is 8 ~ 0L / min, when the current is 50 ~ 250A, the argon flow rate is 2 ~ 5L / min.
4. The length of the tungsten protruding from the gas nozzle is preferably 4 to 5 mm, preferably 2 to 3 mm in the case of poor weldability such as fillet welding, 5 to 6 mm in the deep groove, and the distance from the nozzle to the working More than 5mm.
5. To prevent the emergence of welding holes, welding parts such as rust, oil, etc. must be clean.
6. Welding arc length, welding ordinary steel, to 2 ~ 4mm is better, and welding stainless steel, ~ 3mm is better, too long to protect the effect is not good.
7. In order to prevent the backside of the bottom bead from being oxidized, the back side also needs to carry out the gas protection.
8. In order to make the argon gas well to protect the welding pool, and to facilitate the welding operation, the tungsten center line and the welding part of the workpiece should generally maintain 80 ~ 85 ° angle, fill the wire and the workpiece surface angle should be as small as possible, Generally about 0 °.
9. Wind and ventilation. Where is the wind, please take measures to block the network, and in the room should take appropriate ventilation measures.
Stainless steel pipe MIG welding points and precautions:
1. The use of flat-type welding power supply, DC reverse polarity (wire connected to the cathode)
2. Generally use pure argon (purity 99.99%) or Ar + 2% O2, the flow rate of 20 ~ 25L / min is appropriate.
3. Arc length, stainless steel MIG welding, generally in the jet transition conditions under the welding, the voltage should be adjusted to the arc length of 4 ~ 6mm degree.
4. Windproof. MIG welding is susceptible to wind, sometimes breeze and produce pores, so the wind speed of 0.5m / sec or more places, should take measures to prevent wind.
Stainless steel pipe flux cored wire welding points and precautions:
1. The use of flat welding power supply, DC welding using reverse polarity. Use the general CO2 welding machine can be welded, but the pressure of the wire wheel please slightly loose.
2. Protection of gas is generally carbon dioxide gas, gas flow to 20 ~ 25L / min more appropriate.
3. The distance between the tip and the workpiece is 5 ~ 25mm.
4. Dry elongation, the general welding current of 250A or less when about 5mm, 250A or more when about 20 ~ 25mm more appropriate.