1 vertical external characteristics of power, when using positive polarity direct current (wire then negative)

(2) the following general for 6mm sheet welding, with weld appearance, the characteristics of a small amount of welding deformation

3 shielding gas is argon, 99.99%. When the welding current of 50 ~ 150A, the argon gas flow of 8 ~ 10L/min, when the current is 150 ~ 250A, the argon gas flow of 12 ~ 15L/min.

4 tungsten from conspicuous length of the gas nozzle to 4 ~ 5mm better, sheltered in fillet welding and other poor areas is 2 ~ 3mm, deep in the slot where the 5 ~ 6mm, the distance from nozzle to work is generally not more than 15mm.

5 holes to prevent the emergence of welding, welding parts, if any rust, oil, etc. Be sure to clean up.

6. Welding arc length, welding ordinary steel, to 2 ~ 4mm better, and Stainless Steel Electrode, with 1 ~ 3mm better, too long the protective effect is not good.

7 docking primer, in order to prevent the bottom of the back of the weld is oxidized, the back also need to implement gas.

8 For the protection of argon gas well weld pool and to facilitate the welding operation, the tungsten center line of the workpiece and welding should generally be maintained at 80 ~ 85 ° angle, the angle between the surface of filler wire and the workpiece should be as small as possible, usually 10 ° or so.

9. Windproof and ventilation. Windy place, you are requested to take measures to block network, and in the indoor ventilation should take appropriate measures.

Stainless steel MIG welding points and notes

1 with flat features welding power supplies, DC used the anti-polarity (positive wire connection)

(2) generally use pure argon (99.99%) or Ar +2% O2, flow to 20 ~ 25L/min appropriate.

3 arc length, stainless steel MIG welding, spray transfer is generally the conditions down in welding, arc voltage to be adjusted to the extent of the 4 ~ 6mm.

4. Wind. MIG welding susceptible to the influence of wind, sometimes the breeze and have holes, so wind speed over the place in 0.5m/sec, all precautions should be taken.

Stainless steel flux-cored welding points and notes

1 with flat features welding power, welding using DC reverse polarity. Use of general welding CO2 welding can, but please wire wheel slightly loosen the pressure.

2 shielding gas is usually carbon dioxide, the gas flow rate to 20 ~ 25L/min more appropriate.

3 nozzle and the distance between the workpiece to 15 ~ 25mm is appropriate.

4 dry elongation, the average  Welding Wire of 250A below about 15mm, 250A above about 20 ~ 25mm is more appropriate.
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