04 Dec,2024
Principles for Selecting welding rods
The selection of welding rods must be based on the chemical composition, mechanical properties, plate thickness and joint form of the welded material, the characteristics of the welding structure, the stress state, and the structural usage conditions on the premise of ensuring the safety and feasible use of the welding structure. After comprehensive examination of welding construction conditions, technical and economic benefits, etc., welding rods will be selected in a targeted manner, and weldability tests will be conducted if necessary.
①Choose carbon steel + low alloy steel with different strength levels
It is generally required that the strength of the weld metal or joint is not lower than the lowest strength of the two metals to be welded. The strength of the deposited metal of the selected welding rod should be able to ensure that the strength of the weld and joint is not lower than that of the lower strength base metal. Strength, while the plasticity and impact toughness of the weld metal should not be lower than those of the base metal which has higher strength but poorer plasticity.
②Choose stainless composite steel plate
Three different performance electrodes should be considered for the welding requirements of the base layer, cladding layer and transition layer. For the welding of the base layer, structural steel electrodes with corresponding strength levels should be selected; if the cladding layer is in direct contact with corrosive media, austenitic stainless steel electrodes with corresponding composition should be selected.
③Choose low alloy steel + austenitic stainless steel
Welding rods should be selected according to the values limited to the chemical composition of the deposited metal, but the welding process and specifications should be determined based on stainless steel with poor weldability.
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