Selection Of Stainless Steel Wire

Answer: MIG welding speed of solid stainless steel wire is fast (30-60cm/min), the shielding gas nozzle has run to the front molten pool area, the weld is still in a red-hot high temperature state, oxidized by the air, the surface is oxidized, and the weld is damaged. black. Pickling and passivation can remove black skin and restore the original surface color of stainless steel.

4. Why does the solid stainless steel wire need a pulsed power supply to achieve jet transition and spatter-free welding?

Answer: When MIG welding of solid stainless steel wire, φ1.2 welding wire, when the current I ≥ 260—280A, can realize the jet flow transfer; if the value is smaller than this value, the droplet is short-circuit transfer, and the spatter is large, so it is generally not used. Only when the MIG power supply with pulse is used and the pulse current is greater than 300A, the pulsed droplet transfer under the welding current of 80-260A can be realized without spatter welding.

5. Why is the flux-cored stainless steel wire protected by CO2 gas? Without a pulsed power supply?

Answer: At present, the commonly used flux-cored stainless steel welding wire (such as 308, 309, etc.), the flux formula in the welding wire is developed according to the chemical metallurgical reaction of welding under the protection of CO2 gas, so it cannot be used for MAG or MIG welding; Pulsed arc welding power source.