Snapped Bolts, Poor Mans Oxy?

hey guys i have some snapped bolts some flush some have a little meat hanging out they SS bolts in a aluminium outboard block so seized with salt and corrosion



just wondering if i could use a DC TIG welder to heat the bolt to crack the bond in the thread instead of using an oxy for the job?



was thinking of heating the bolts if this works and cycling it a couple of times than using the youtube tricks by welding a washer and nut over the bolts and unscrewing



what do u think?