1.It only replies to MILD STEEL welding, and please choose 200MM wire reel rather than 100MM . 2.It is recommended to use 0.8mm 1.0mm ER70S-6 in the states of CO2/MIG and MAG 3.In the state of GASLESS，‘Flux’，‘1.0’, there are only 2 alternatives for you. You can choose wire feed rolls 1.0 when you need to use 1.0mm ET71-GS; and you can choose wire feed rolls 0.8 when you need to use 0.9mmET71-GS. 4. Perfectly solder mild steel, easy to operate, only need to adjust the current, and the voltage will be automatically matched. 5. In the state of GASLESS , the GASLESS WIRE can be used without CO2 or CO2/Ar gas. The welder can be used directly in any situation.