Difficulty fabricating clad header boxes

[kevlar49]

I have tried specifying alloy clad header boxes for air coolers, but have received resistance to doing that. I have asked why this cannot be done, but have not understood the constraints. Can someone with fabrication experience explain why would it be so difficult to weld clad plate to form a clad header box? I always thought that the root pass could be easily made with enough alloy filler to avoid dilution with subsequent passes made with carbon steel.

Being able to use clad plate instead of carbon steel would greatly reduce the cost of the exchanger.

 

[metengr]

This is a cross post, please see
thread330-174701