What is the difference on stainless steel Mig welding wire, stainless steel flux cored welding wires
一． The power supply with vertical external characteristics is adopted, and the positive polarity is adopted in DC (the welding wire is connected to the negative pole)
1.It is generally suitable for the stainless steel welding wires of thin plates below 6mm, with the characteristics of beautiful weld formation and small welding deformation.
2.The shielding gas is argon with a purity of 99.99%. When the welding current is 50 ~ 150A, the argon flow is 8 ~ 10L / min, and when the current is 150 ~ 250A, the argon flow is 12 ~ 15L / min.
3.The length of tungsten electrode protruding from the gas nozzle is preferably 4 ~ 5mm, 2 ~ 3mm in places with poor shielding such as fillet welding, 5 ~ 6mm in places with deep groove, and the distance from the nozzle to the working is generally no more than 15mm.
4.In order to prevent the occurrence of welding pores, the welding parts must be cleaned if there is rust, oil stain, etc.
5.For the length of welding arc, when welding ordinary steel, 2 ~ 4mm is preferred, while when welding stainless steel, 1 ~ 3mm is preferred. If it is too long, the protection effect is not good.
6.During butt backing, in order to prevent the back of the underlying weld bead from being oxidized, the back also needs to be protected by gas.
7.In order to protect the welding pool well with argon and facilitate the welding operation, the angle between the center line of tungsten electrode and the workpiece at the welding position shall be generally maintained at 80 ~ 85 °, and the included angle between filler wire and workpiece surface shall be as small as possible, generally about 10 °.
8. Windproof and ventilation. Where there is wind, please take measures to block the net, and take appropriate ventilation measures indoors.
二. Key points and precautions for stainless steel Mig welding wire
1.Flat special welding power supply is adopted, and reverse polarity is adopted in DC (welding wire is connected to positive electrode)
2.Generally, pure argon (purity: 99.99%) or Ar + 2% O2 is used, and the flow rate is 20 ~ 25L / min.
3.The arc length of stainless steel Mig welding wires are generally welded under the condition of spray transition, and the voltage should be adjusted to the extent that the arc length is 4 ~ 6mm.
4. Stainless steel Mig welding wire is easily affected by the wind, and sometimes air holes are generated by the breeze. Therefore, windproof measures should be taken where the wind speed is more than 0.5m/sec.
三, Key points and precautions of stainless steel flux cored welding wire
1.Flat welding power supply is adopted, and reverse polarity is adopted during DC welding. Ordinary CO2 welding machine can be used for welding, but please loosen the pressure of wire feeding wheel slightly.
2.The shielding gas is generally carbon dioxide, and the gas flow rate is 20 ~ 25L / min.
3.The distance between the welding nozzle and the workpiece should be 15 ~ 25mm.
4. The dry extension length is generally about 15mm when the welding current is below 250A and about 20 ~ 25mm when the welding current is above 250A.