Finaly made the core suport and layed my intercooler pipes and was able to do it just thinking I may try and make the pipes with less boots

I finaly decided to try some intercooler pipe. I got some cuts layed out and geting ready to tack it up.the last try looked like burnt or sunken in a few dabs was at 90 amp 3/32 and the 100hz and 45 % I am new at this so my macine starts at 25% and I believe to 80 were should the sweet spot be this China box instructions are impossible like my message

Playing with aluminum is the black soot loss of coverage or diping tungsten

New to tig welding .got a new tig ac dc inverter box from over seas it's got lots of features almost overwhelming I also have a 64 ford f100 swb that I 4linked and built a twin turbo 472 and now working on plumbing and have to learn aluminum and stanless