... convenience dexterity.7.Allocating various types of welding head: Convenient and dexterous welding head, pure copper design, highly conductive ... manual operation.disadvantageNot suitable for large square, lots of welding, or copper, aluminum, ZAS non-iron metalRepairing ways ... -piece material.Stainless steel has the characters of corrosion resistance, hardness moderate (HRC20) H08 alloy steel with the ...