How To Weld Aluminum Engine Case. Overheating a heat-treated aluminum alloy can anneal soften the casting. On reciprocating engines and lists welding of crankcases as major repair.
For welds needing deeper penetration an argonhelium mix is. There are many ways to weld aluminum engine cases like it can be done with a stick welder TIG welder and MIG welded. You would then have to re-drill and tap the thread for the pressure sensor again and hope for the best.
As most engine heads are aluminum A-356 or A-355 castings TIG welding is the best process.
Preheat the aluminum workpiece. There are many ways to weld aluminum engine cases like it can be done with a stick welder TIG welder and MIG welded. 02 getting the oil out of the pores to weld is a PIA. TIG welding cast aluminum should always be done with pure argon gas not an argonCO2 mix as is common with MIG welding.