ER70S-3 welding wire can replace ER70S - 6 welding wire?

1, different silicon manganese content: ER70S - 3 is low manganese silicon wire.ER70S - 6 is high manganese silicon

　　2, impact toughness, different requirements: ER70S 27 - 3-20 degrees.And ER70S - 6 is 30 degrees - 27.

　　ER70S - 3 DC + 1.Low carbon steel thin plate welding.

　　ER70S - 6 DC + 1.All kinds of 500 mpa grade welding steel parts

　　Q345D for low alloy steel

　　Q345D steel plate welding need to preheat.Because the carbon content is higher.

　　The purpose of hot cold cracks is to prevent.Cold crack and a direct relationship between the carbon equivalent.Therefore want to distinguish the materials of carbon equivalent Q345A (before the brand name of 16 mn), Q345D carbon equivalent is the same.Q345 carbon equivalent of less than 0.3%.So Q345A is normally not preheating.But when the plate is very thick.Due to the fast cooling, or preheating.20 # steel with J422 (E4303) welding crack.If the thickness is more than 70 mm, no preheating is risky.

　　The Q345D and usual we commonly distinguishes between Q345A less impurity S, P, low temperature impact performance is better. In terms of welding, when the parent metal impurity element.To control the welding thermal crack is good.

　　Since the choice of parent metal Q345D material, of course.