I’ve used a mig to remove broken bolts from a couple different engines in the past and had good luck with it. however this time it’s kicking my butt and I’m not having much luck. I don’t remember what welder settings I used last time and was wondering if you guys have advice? I’ve got a Lincoln Weld pak and this time I set it at the highest heat rating (D) and a feed speed of about 7. But for some reason I’m not getting the weld to stick to the broken bolt consistently. I’ve gotten good penetration twice and both times it broke off part of the bolt because it’s really stuck in there (the dreaded steel bolt in an aluminum head by exhaust). now the bolt is about 1/4” below the surface and I don’t seem to be getting it to stick anymore. I saw one video where the guy set his Lincoln on heat range B, one of the colder settings and a low wire speed of only 3 and had good luck. Could it be my wire speed/heat combination is filling the whole to quick? also, how long do you guys wait after welding before you try turning it out? I’ve done both cherry red and a couple minutes. finally, I have two exhaust studs that I used an oxy torch to heat up the nuts and get them off no problem. Do you think I should try and replace the studs while the engine is out or take my chances with new nuts and hope the studs don’t break when I reinstall it? If I should take them out, should I try heating the exposed part of the stud cherry red and wait a till it’s not red before turning them out? appreciate any advice.