The most commonly used is carbon steel ER50-6, and this wire for Q345 less able to weld steel, grade a little higher is ER55-B2,600 can be welded to the tension level.Stainless steel is commonly Stainless Steel Electrodeused ER308 L, ordinary stainless steel can be welded, but generally do not have the domestic CE certification, ESAB have CE certification of commonIs ER 308L Si.