Pore Creation
Possible Reasons:
1.Insufficient gas shielding.
2.Used gas is dirty or gas flow speed is not suitable.
3.Surface of the welding wire is dirty.
4.Workpiece is dirty.
5.Voltage value is too high.
6.Distance between the nozzle and workpiece (free wire length) is too much.
Solutions:
Insufficient Fusion
Possible Reasons:
19 Failures in Welding Seams
Expressweld MasterMIG 500W
Page 34
1.
To remove all air within the welding area, increase the gas flow rate. To prevent the
entry of turbulence and air into welding seam, do not set the flow rate to an
extremely high value. Clean splashed burr particles from nozzle. Prevent leakages
in the gas hose. Stop air flows that directly reachs to arc (operating fans, open
doors, etc). When welding with C02 gas, to prevent clogging of the regulator due
to freezing use heater or connect several gas cylinders to eachother. Decrease
the advancing speed. Decrease the distance between nozzle and workpiece. Until
molten metal become solid, keep the torch at the end of the welding seam.
2.
Use a quality gas manufactured for welding. Adjust the gas flow rate.
3.
Only use clean and dry welding wire.
4.
Remove all oil, grease, rust, paint and dirt from workpiece surface. Use a welding
wire that contains more oxide solvent element.
5.
Decrease the voltage value.
6.
Shorten the length of free wire (at nozzle outlet).
1.
There is coating or extreme oxide layer on the surface in welding area.
2.
Heat input is insufficient.
3.
Weld puddle is bigger than needed.
4.
Applied welding technique is wrong or movement to torch is irregular.
5.
Seam connection shape is wrong.
6.
Advancing speed is too high.
