SS welding wire problem

Question

SS welding wire problem

vinodkei (Materials)

(OP)

6 Dec 02 06:52

We have purchased 304 high Mn (DIN 8556 1.4370) for MIG welding of SS plates and strips (2 & 3 mm thick). The wire is 1.2 mm dia with negative tolerance.

The welding works for approx. 10 minutes before stopping. The machine makes Squeaking sounds and overloads. Error sign is displayed on the machine. After 10 minutes or so, or after dipping the torch in water, the machine starts again, but welds for 5-7m minutes before stopping.

We have not faced this problem with our other supplier. All welding parameters remain same for both suppliers.

Welding parameters are:
V 17 to 25
A 80to 150
Feed rate is 4 to 7.5 meter per minute.

We are unable to understand what can cause this problem. The wire is smooth oil drawn and dia is very much under tolerances.

The nozzle of torch is 1.2 mm but we have tried with 1.6 mm also. The problem remqains the same.

Please advise.

Many thanks in advance.

Regards

Vinod Chauhan
India

TheBlacksmith (Mechanical) · Answer 1 · 2002-12-06 08:03:50

Perhaps you should just use the other supplier, if they gave no problem. It is obviously a heating problem, check for proper gas flow rate/nozzle obstructions. Perhaps the gun or liner is worn/damaged. If all this checks out okay, the wire is doing something weird - just use the other supplier.

Blacksmith

pipeingg (Industrial) · Answer 2 · 2002-12-10 17:08:43

sounds like overheating to me,expansion in the gun is jamming the wire and your wire feeder is slipping as it slides over the wire

darcyo (Structural) · Answer 3 · 2002-12-11 10:18:41

Vinod,
what condition is the wire in? was the wire ever exposed to moisture? is the oil coated? are you using the proper contact tube (proper internal diameter) for the wire? have you measured the wire diameter? anyway, the point of these questions is to determine if there is any higher-than-normal resistance between the contact tube and the consumable wire. higher resistance values here would cause the voltage to increase and the arc current to decrease. either way, it sounds like this voltage peak is beyond the duty cycle of your machine.
hope this helps.

mcprofusion (Industrial) · Answer 4 · 2002-12-15 12:35:55

Yes ..i agree with the above..check wire condition, moisture etc..and change suppliers. Your liner could be clogging up thus giving you feeding problems and in turn overloading your wirefeeder.

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SS welding wire problem