Selection principle of welding rod

29-04-2019

Selection principle of welding rod


The electrode used to ensure the security of the welding structure, practical use under the premise of according to the chemical composition, mechanical properties of the welding material, thickness and joint form, the structure of the welding structure characteristics, stress state, conditions of use requirements on the properties of weld and welding construction conditions and technical and economic benefit after comprehensive examination, a targeted select electrode, when necessary, weldability test is also required. [1]

Choose the point

(1) considering the mechanical properties of weld metal and chemical composition for ordinary structural steel, usually requires weld metal and base material strength, should choose the tensile strength of deposited metal is equal to or slightly higher than the base metal welding rod. For alloy structural steel, sometimes the composition of the alloy is required to be the same or close to the base metal. The welding rod with lower strength than the base material should be considered when the welding structure is rigid, the joint stress is high and the weld seam is easy to crack. When the content of carbon, sulfur, phosphorus and other elements in the base metal is on the high side, it is easy to produce cracks in the welding seam. (2) consider the performance of welding components and working conditions to bear the load and impact load of the welding pieces, in addition to meet the strength requirements, the main should ensure that the weld metal has a high impact toughness and plasticity, can choose plastic, toughness index is high low hydrogen type electrode. For welding parts in contact with corrosive medium, stainless steel electrode or other corrosion-resistant electrode shall be selected according to the nature and corrosion characteristics of the medium. For welding parts that work under high temperature, low temperature, abrasion resistance or other special conditions, suitable heat resistant steel, low temperature steel, surfacing welding or other special purpose welding rods shall be selected. (3) considering the characteristics of the welding structure and stress conditions on the structure of complex shape, rigid large thick welding parts, due to the welding process produces a lot of internal stress, easy to make the weld crack, should choose the resistance to crack good alkaline low hydrogen electrode. For welding parts with little stress and difficult to clean up the welding parts, acid electrode which is not sensitive to rust, oxide and oil should be selected. For welding parts that cannot be turned over due to limited conditions, welding rods suitable for all-position welding shall be selected. (4) consider the construction conditions and economic benefits in the case of meeting the product performance requirements, should choose the technology of good acid electrode. Acid or low dust electrodes should be used in small or poorly ventilated areas. For the structure with large welding workload, if possible, use high-efficiency electrode, such as iron powder electrode, high-efficiency gravity electrode, etc., or select the bottom electrode vertical downward electrode and other special electrode, to improve the welding productivity.

welding wire


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