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13 Checking the Quality of the Weld
©Walter Stauffenberg GmbH & Co. KG
All rights reserved – Reprinting, in whole or in part, only with the approval of the manufacturer
13
Checking the Quality of the Weld
You can check the quality of the weld by means of a visual inspection and a bending
test.
The number and type or method of the tests to be performed and the acceptance
criteria are defined in respective standards (see inter alia: ISO 14555)
for quality demands.
For obtaining the maximum power rating of the weld joint, in usage with STAUFF
Clamps, is a maximum height of the welded element of 13.0 mm observed.
In addition, the maximum torque rating of 6 Nm must be adhered in the
application. Specific series can limit the torque additionally. In case of doubt,
please contact STAUFF.
13.1 Carrying out Visual Inspection
Carry out a visual inspection on all welding elements.
Visual Inspection
Condition
Possible cause
Corrective actions
Collar regular, bright and complete.
Lengths after weld within tolerances
Correct parameters
none
Contraction of weld collar
Welding element too long
Plunging depth or lift too low
Increase plunging depth,
check lift and centering of the
ceramic ring
Weld power too high
Reduce current and/or time
Ceramic ring not centered
correctly
Check centering
Plunge rate too high
Adjust plunge and/or gun
dumper
Weakly developed, uneven weld collar
with mat surface
Welding element too long
Weld power too low
Increase current and/or time
Ceramic ferrule is moist
Dry out ferrules in oven
Lift too low
Increase lift
Collar off centre
Undercut
Effect of arc blow
See arc blow effect
Ceramic ferrule incorrectly
centred
Check centring
Weld collar low, shiny surface with
many spatters
Welding element too short
Weld energy too high
Decrease current and/or time
Plunging speed too high
Adjust plunging depth and/or
damping factor