7 Start-up and weld quality check Page 45
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
7.5.2 Visual inspection “short cycle drawn arc process”
In this operating manual, the weld joint check is limited to visual inspection of the
welds. A description of the mechanical and technological tests would go beyond the
scope of this operating manual.
Detailed information on this can be found in EN ISO 15614-1, 2*)
1. Defect-free weld
Weld bead is even, no visible flaws.
Corrective action: Not necessary. No change to the
electrical and mechanical parameters.
2. Defective weld
Diameter not fully welded.
Corrective action: Increase welding current and/or welding
time, possibly change polarity.
3. Defective weld
Large, uneven weld bead.
Corrective action: Reduce weld time.
4. Defective weld
Pores in the weld bead.
Corrective action: Reduce weld time or increase weld
current, weld under shielding gas.
5. Defective weld
Weld bead one-sided.
Corrective action: Eliminate blow effect by applying
smoothing compound or correcting the earth clamps.
*) EN ISO 15614-1, 2: Specification and qualification of welding procedures for metallic
materials – Welding procedure test
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