... over hot,etc. 2).Digital auto-control,it has the function of manual,automatic and heating-keeping-cooling divide ... machine:Deeply heating-shapingStandard parts,fasteners,automobile parts,hardware tools,gears,big steel pipesthrough heating.Heat treatingVarious kind ... head,knives,and many metal modules welding;grinding tools,drilling tools,cutting toolswelding;welding mallet alloy;red copper;welding ...