Hebei XINYU Welding Co., Ltd.

MAG/CO2 Welding

Product Description

(1)Notice about MAG / CO2 welding:

1. Please use specialized welding gas, eg: purity of CO2≥99.5%,H2O≤0.005%,Ar≥99.99%. Gas flow: 20~25L/min.

2. Wind affects arc and welding pool, please take steps to block the wind.

3. There is smoke when welding, pay attention to ventilation.

4. Distance between Tip and base steel is about 15mm when current is below 250A; and 20~25mm when current is above 250A.

5. Welding materials should be stored in dry places.

6. Please check the welder ,wire feeder, gas regulator and heater before operation.

7. Please keep the percentage of mixed gas stable and keep gas pressure stay the same.

8. As to thin steel plate, downward welding in the inclined position or forward welding is recommended,(pictures are followed below).

9. Please move Plastic Spool and Basket Spool in a correct way.


 Relation among base metal, weld gun and bead: 


 (2)Welding conditions & effect:

About MAG/CO2 welding,different welding conditions affect bead appearance and penetration state greatly, please choose the right conditions according to your purpose. 

a. Angle of weld gun (backward)

( 1 )Narrow and convex bead

( 2 )Deep penetration

( 3 )Apt to blow hole


b. high welding speed

( 1 )Narrow and convex bead

( 2 )Penetration become shallow

( 3 )Splash become more


c. Tip is much high to the base

( 1 )Wire feeding speed stable, while current becomes low

( 2 )Bead is not apt to be straight


d. Base Surface

 Blow holes are apt to appear when oil paint rust coating on the base


e. Shielding Gas

( 1 )Wind or not enough gas flow generates blow holes.

( 2 )Arc shape, bead shape&deposited metal properties vary with shielding gas


f. Gas hood height

( 1 )More height&less shielding gas let blow holes appear

( 2 )Too low&long time welding, splash will be attached and block our view


g. Too high current

( 1 )Wider bead

( 2 )Deeper penetration

( 3 )More convex bead

( 4 )Smaller splash

( 5 )Big welding pool, not good bead shape


h. Too long arc

(Too high voltage)

( 1 )Wider bead

( 2 )Even bead

( 3 )More shallow penetration

( 4 )Bigger splash