1. Selection of Soild Welding alloy Wire
(1) submerged arc welding wire
During submerged arc welding, flux plays a role of protection and metallurgical treatment on weld metal. Welding wire is mainly used as filler metal, and alloy elements are added to weld metal and participate in metallurgical reaction.
1) welding wire for low carbon steel and low alloy steel
There are three types of welding wires commonly used for submerged arc welding of low carbon steel and low alloy steel.
A. low manganese welding wire (such as H08A): it is often used for welding low carbon steel and low alloy steel with high manganese flux.
B. medium manganese welding wire (such as H08MnA, h10mns): it is mainly used for welding of low alloy steel, and it can also be used for welding of low carbon steel with low manganese flux.
C. high manganese welding wire (such as H10Mn2 h08mn2si): used for welding of low alloy steel
(2) high strength steel welding alloy wire
This kind of welding wire contains more than 1% Mn and mo0.3% ~ 0.8%, such as H08MnMoA and h08mn2moa, which are used for welding high strength low alloy steel. In addition, Ni, Cr, V and re can be added to the welding wire to improve the weld performance according to the composition and service performance requirements of high strength steel. MN-MO series welding wire, such as H08MnMoA, is mostly used for weld metal with tensile strength of 590MPa.
(3) welding alloy wire for stainless steel
The composition of the welding wire shall be basically the same as that of the stainless steel to be welded. When welding chromium stainless steel, hocr14 h1cr13 h1cr17 and other welding wires shall be used; when welding chromium nickel stainless steel, h0cr19ni9 hocr19ni9 hocr19ni9ti and other welding wires shall be used; when welding ultra-low carbon stainless steel, corresponding ultra-low carbon welding wires shall be used, such as hoocr19ni9 and so on. The welding flux can be smelting type or sintering type, and the welding flux is required The oxidation property is small, so as to reduce the burning loss of alloy elements. At present, sintering flux is mainly used to weld stainless steel in foreign countries, while melting flux is still the main one in China, but sintering flux is being developed and popularized.
