Best practices to follow 20 TORCH MPM.pptx

Best practices to follow in 20torch

1. 20 TORCH MPM BEST PRACTICES

2. WELD DETAILS

3. POROSITY CAUSES Insufficient / Impure gas shielding. Rust/dirt/grease in the tube/fin. PREVENTION Ensure sufficient quantity of shielding gas flow. Ensure that the tube and fin are free from Rust/dirt/grease. Fan should not be directed towards the weld region. Slowing the welding speed to allow time for gas to escape Ensure that the as nozzle is free from spatter.

4. FIN FLY CAUSES Improper calibration of fin. Twist of fin. Ideal condition Fin not properly aligned PREVENTION Ensure that the fin is properly calibrated . Fin should be straight and without any twist.

5. FIN FLY

6. METAL DROP In overhead position. CAUSES High current. High heat input PREVENTION Using proper current and voltage in the overhead position . Heat input should be controlled.

7. WELD OFFLINE CAUSES Fin fly. Torch not aligned properly. Deviation PREVENTION Proper monitoring of the weld bead. Proper adjustment of the torch

8. SKIP CAUSES Stoppage of machine during welding due to: arc down due to improper wire/contact tip other reasons PREVENTION Prevent unnecessary stopping of the machine . Ensure that the contact tip used is of correct size.

9. UNDERCUT CAUSES High current. Large undercut on the tube side is not acceptable PREVENTION Use proper current. Large undercut on the tube side is not acceptable

10. GOOD PANEL WELD

11. TO ENSURE PROPER WIRE FEEDING… Appropriate pressure force should be set for the wire diameter. For 1.2 mm diameter wire, the scale setting should be 2 to 3. Ensure that the wire is free from rust. Clean the liner and wire feeder periodically. Proper contact tip should be used.

12. EFFECTS OF CHANGE IN PARAMETERS