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Application of Welding Materials

Release time:

2023-08-11 20:01

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The welding material plays the following roles in the welding process:(1) Protective effect: The gas, slag or directly input protective gas generated by the welding material during welding isolates the molten metal from the outside air and prevents the metal from being oxidized or nitrided., So as to play a protective role. For example, the gas and slag generated during the heating and melting of the electrode coating play a role of gas-slag joint protection for the molten metal. After the submerged arc welding flux melts, a slag liquid film is formed around the arc cavity to isolate the air. Gas shielded welding plays a role of mechanical protection by directly inputting protective gas into the welding area to exclude the air in the arc space. (2) Metallurgical action: during the welding process, a series of chemical metallurgical reactions occur between the welding material and the molten metal. On the one hand, it can transfer the beneficial alloying elements to the weld, on the other hand, it can exclude the sulfur, phosphorus, oxygen, nitrogen, hydrogen and other impurities in the weld, so that the weld can obtain the required chemical composition, improve the organization and improve the performance. (3) filling function: as the welding material of filler metal, the groove on the weldment can be filled after melting to form a solid weld. (4) improve the welding process performance: through the welding material can stabilize the arc, reduce spatter, improve the weld formation, so that the welding process performance is improved.
electrode can be divided into acid electrode and alkaline electrode two categories, commonly used in the production of acid electrode for titanium calcium electrode, commonly used alkaline electrode is carbonate and fluorite based on low hydrogen electrode. 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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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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