Welding Process - WIKA REFRACTO-PAD TC59-R Manual De Instrucciones

6. Commissioning, operation
6.4 Tests/Checks
Test loop resistance of the thermocouple circuit at ambient temperature prior to welding/
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routing the REFRACTO-PAD
After completing the welding/routing of the REFRACTO-PAD
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resistance at ambient temperature and compare.
EN
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If a deviation of greater than 5 % between readings occurs, please contact WIKA.
Perform any non-destructive examination or heat treatment as required.
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Ensure adequate tube wall thickness at the weld locations. This can be checked by
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thickness testing to customer specifications.

6.5 Welding process

Gas Tungsten Arc Welding (GTAW) is the suggested welding process due to its relatively
clean weld. During welding operation, the requirements of the relevant material data
sheets and the applicable directives and standards must be considered regarding the
heat treatment, filler rods or welding procedures. Proper installation is a major step in the
success of a REFRACTO-PAD
most rugged sensors available, it can be destroyed by improper welding.
6.6 REFRACTO-PAD
Locate the thermocouple at the appropriate location on the tube.
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Weld the thermocouple pad to the tube.
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Use 3.2 mm (1/8") fillet weld to weld 3 sides using one continuous pass (see figure 1).
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WARNING!
Do not weld the end where the sheath leaves the REFRACTO-PAD
WARNING!
Ensure the thermocouple tip is in contact with the furnace tube.
12
, record results.
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installation. Although the REFRACTO-PAD
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welding
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WIKA operating instructions model TC59-R (REFRACTO-PAD
to the tube, test loop
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is one of the
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.
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)
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