CEBORA S.p.A. 8
3.302.140 21/05/03
3.2.4 - In load operation, the welding quality is not satisfactory.
NOTE
During welding is possible to meet different type of difficulty, depending of the welding
condition.
Due to the circuit simplicity, and the lack of automatism that bind power source functions
between them, optimal welding condition must have sought manually and experimentally by the
operator, operating on power source commands.
Following are listed some of the most frequently troubles, with some simple suggestion in
order to find problems solutions.
Causes and solutions may have found also by power source adjustments optimization, or by
performing the TESTS of the previous paragraphs, in order to verify power source single
apparatus correct working conditions.
1. Welding current insufficient:
− Selectors (15) wrong setup (output voltage too low);
− Rectifier bridge (38) defective;
− Torch or work cables connections defective.
2. Welding with a lot of metal spatter:
− Selectors (15) wrong setup (output voltage too high);
− Work cable connection defective.
3. Wire flowing difficult.
− Roll spring wrong adjustment;
− Wire roll wrong alignment;
− Drive roll with too large a grove;
− Contact tip with wrong diameter;
− Wire sheath partially clogged;
− Consider that wire speed is affected by the power source output voltage variations (by
effect of the open circuit to load voltage drop of the transformer (46)), since the wire
feeder motor supply voltage is picked-up from the rectifier bridge (38) output.
4. Excessive porosity in the welding seam.
− Excess oxidation of the edges to be welded;
− Gas nozzle partially or completely clogged.
M12179B, MB120A, WFW12179, 117-092, 83-363 (Mig 110)
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