Thermocouple and pin capacitor discharge welding
Thermocouple and pin capacitor discharge welding
(OP)
Almost all codes give the maximum of 125 watt seconds (Joules) for attaching thermocouples and insulation pins to code parts using capacitor discharge welding.
How was this limit reached? is it perhaps a carry-over from the withdrawal arc welding that was used prior to the introduction of CDW?
We find that for welding 12 gauge pins 125 watt seconds often does not give an acceptable weld. This leaves more arc marks than using a higher watt second setting.
Is there an acceptable way to increase this requirement?
Thanks
How was this limit reached? is it perhaps a carry-over from the withdrawal arc welding that was used prior to the introduction of CDW?
We find that for welding 12 gauge pins 125 watt seconds often does not give an acceptable weld. This leaves more arc marks than using a higher watt second setting.
Is there an acceptable way to increase this requirement?
Thanks





RE: Thermocouple and pin capacitor discharge welding
With that said, if you have actual test data that you would be willing to share, this could be presented to BPV I and a revision can be made. However, if you are unwilling to share your test data or the data is proprietary, there is no chance for revision.
RE: Thermocouple and pin capacitor discharge welding
If your parts receive subsequent PWHT, you can increase the 125 watt-sec to whatever fits your need.
RE: Thermocouple and pin capacitor discharge welding
RE: Thermocouple and pin capacitor discharge welding
Thanks again
RE: Thermocouple and pin capacitor discharge welding