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Principles for selection of welding materials
Release time:
2023-08-11 20:01
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weld metal shall be higher than or equal to the lower limit of the specified value of the corresponding base metal standard or meet the technical requirements specified in the drawing. The requirements for weld metal of various steels are as follows: the properties listed in the
welding material standard or product samples are all the properties of deposited metal (excluding base metal) of welding materials, while the properties of welded joints depend on the weld metal (including welding, deposited metal and base metal) and welding process. At present, no welding material can act on the heat affected zone in the welded joint during welding to change its properties, from the selection of welding materials can only consider the performance of weld metal, in order to ensure the performance of welded joints also need welding process (especially post-weld heat treatment, line energy). JB/T4709-2000 principle stipulates that "the performance of weld metal shall be higher than or equal to the lower limit of the specified value of the corresponding base metal standard or meet the technical requirements specified in the drawing" as the general policy for selecting welding materials.
Key words:
Welding materials
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Considerations for Welding Materials (Electrodes, Wires and Submerged Arc Flux)
1. Welding rod (1) Stainless steel welding rod usually has two kinds of titanium calcium type and low hydrogen type. Welding current as far as possible the use of DC power supply, is conducive to overcome the welding rod redness and penetration. The electrode of titanium calcium type drug skin is not suitable for all-position welding, only suitable for flat welding and flat fillet welding. The electrode of low hydrogen type drug skin can be welded in all positions.
Considerations for Welding Materials (Electrodes, Wires and Submerged Arc Flux)
1. Welding rod (1) Stainless steel welding rod usually has two kinds of titanium calcium type and low hydrogen type. Welding current as far as possible the use of DC power supply, is conducive to overcome the welding rod redness and penetration. The electrode of titanium calcium type drug skin is not suitable for all-position welding, only suitable for flat welding and flat fillet welding. The electrode of low hydrogen type drug skin can be welded in all positions.
Maintenance of welding materials
1. The welding material warehouse shall be kept at a suitable temperature and humidity, with a temperature of ≧ 5 ℃ and a relative humidity of ≦ 60%. The room shall be kept clean and dry, and harmful media shall not be stored. Every day after work, before work temperature and humidity inspection (not less than twice a day) and record.
Principles for selection of welding materials
The welding materials shall be selected according to the chemical composition, mechanical properties and welding performance of the base metal and in combination with the structural characteristics, service conditions and welding methods of the pressure vessel, and shall be determined through tests if necessary.
Application of Welding Materials
Electrodes can be divided into two categories: acid electrode and alkaline electrode. The acid electrode commonly used in production is titanium calcium electrode, and the alkaline electrode is low hydrogen electrode mainly composed of carbonate and fluorite. Acid electrode arc is more stable, strong adaptability, AC and DC welding machine can be applied, but the mechanical properties of the weld is general, crack resistance is poor. Alkaline electrode arc ignition is more difficult, arc is not stable, poor adaptability, only suitable for DC arc welding machine, but the mechanical properties and crack resistance of the weld is better, suitable for medium carbon steel, high carbon steel welding.
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