(B) wire

CO2 Gas Shielded Welding Wireas a filler metal electrode, so the wire is necessary to guarantee a certain chemical composition and mechanical properties, but also to ensure has good electrical conductivity and process performance.

1, the welding wire

(1) a deoxidizer wire must contain a certain amount of deoxidizing agent, in order to prevent the generation of porosity, reduce the spatter and to improve the mechanical properties of the weld metal. For low carbon and low alloy steel welding wire in CO2 welding, the main deoxidizer is Si and Mn. Its content range of Si is 0.5% to 1%, and Mn is 1% to 2.5%. Mn, Si ratio of about 1.2 to 2.5, and to play a beneficial effect of the joint deoxidation of Si-Mn-.

(2) C, S, P wire carbon content must be low, requires C <0.11%, which is very important for avoiding the porosity and reduce spatter. Sulfur and phosphorus content requirements for the average wire are ≤ 0.04%; requires sulfur and phosphorus content of ≤ 0.03% for the high-performance, high-quality CO2 wire.

(3) in order to rust and to enhance conductivity, wire surface copper plating. However, the copper content of the copper wire can not be too large, otherwise it will form a low-melting eutectic, affecting the ability of the cracking resistance of the weld metal. Requires copper wire the copper content is not more than 0.5%.

(4) the size deviation Gas Shielded Welding Wiresupply status should be cold drawn state. Caramelized roundness error requires no more than 75 percent of the allowable deviation in diameter. Wire diameter and tolerances shall comply with the requirements in Table 3-1.