Welding rod selection method

04-03-2019

Welding rod selection method

The selection of the electrode must be carried out to ensure the safe and reliable use of the welded structure.

According to

The chemical composition, mechanical properties, thickness and joint form of the welding material, welding structure characteristics, stress state, structural use conditions, weld performance requirements,

After comprehensive examination of welding construction conditions and technical and economic benefits, the selected welding rods are used in a targeted manner.

A weldability test is also required if necessary.

Welding rod selection principle

The selection of the electrode must be carried out to ensure the safe and reliable use of the welded structure.

According to

The chemical composition, mechanical properties, thickness and joint form of the welding material, welding structure characteristics, stress state, structural use conditions, weld performance requirements,

After comprehensive examination of welding construction conditions and technical and economic benefits, the selected welding rods are used in a targeted manner.

A weldability test is also required if necessary.

Selection of welding rods for welding of the same kind of steel

1) Considering the mechanical properties and chemical composition of the weld metal For ordinary structural steels, the strength of the weld metal and the base metal is usually required. The welding rod with a tensile strength equal to or slightly higher than the base metal should be used. For alloy structural steels, it is sometimes required that the alloy composition be the same as or close to the parent metal. In the unfavorable case of high rigidity of the welded structure, high joint stress and easy cracking of the weld, it is considered to select an electrode with lower strength than the base material. When the content of carbon, sulfur, phosphorus and other elements in the base metal is high, the weld is prone to cracks, and an alkaline low-hydrogen electrode with good crack resistance should be selected.

1) Considering the mechanical properties and chemical composition of the weld metal For ordinary structural steels, the strength of the weld metal and the base metal is usually required. The welding rod with a tensile strength equal to or slightly higher than the base metal should be used. For alloy structural steels, it is sometimes required that the alloy composition be the same as or close to the parent metal. In the unfavorable case of high rigidity of the welded structure, high joint stress and easy cracking of the weld, it is considered to select an electrode with lower strength than the base material. When the content of carbon, sulfur, phosphorus and other elements in the base metal is high, the weld is prone to cracks, and an alkaline low-hydrogen electrode with good crack resistance should be selected. 2) Considering the use performance and working conditions of welded components For weldments subjected to dynamic loads and impact loads, in addition to meeting the strength requirements, it is mainly to ensure that the weld metal has high impact toughness and plasticity, and the plastic and toughness indexes are higher. Low hydrogen electrode. For welding parts working under high temperature, low temperature, wear resistance or other special conditions, the corresponding heat resistant steel, low temperature steel, surfacing or other special purpose welding rods shall be selected. 3) Considering the characteristics of the welded structure and the stress conditions. For thick welded parts with complex structural shapes and large rigidity, due to the large internal stress generated during the welding process and the cracks in the weld, the alkali with good crack resistance should be selected. Low hydrogen electrode. Little stress,

For welded parts that are difficult to clean the welded parts, acid electrodes that are not sensitive to rust, scale and oil should be used. For weldments that are subject to conditions that cannot be reversed, electrodes suitable for all-position welding shall be used. 4) Considering construction conditions and economic benefits In the case of meeting the performance requirements of the product, a good-quality acid electrode should be selected. In the case of small or poor ventilation, acid electrodes or low-dust electrodes should be used. For structures with large welding workload, high-efficiency welding rods, such as iron powder electrodes, high-efficiency gravity welding rods, etc., or special welding rods such as bottom electrode and vertical down welding rods should be used to improve welding productivity.

welding rod、Welding wire、Welding machine.


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