Welding materials for nickel tube fittings shall meet the following requirements:

1. The welding materials used for nickel tube welding shall have an ex-factory quality certificate, and the inspection items shall comply with the provisions of GB/T13814, GB/T15620, and GB/T15620, and argon shall comply with the provisions of GB4842, pure argon.

What are the welding material requirements for nickel pipe fitting?

2. Welding materials of nickel pipe fittings shall be inspected before storage, and shall be marked after acceptance.

3. If there is any objection to the characteristic data in the welding quality certificate, or if there is any doubt about its quality, the corresponding retest shall be conducted according to the corresponding technical standards.

4. The storage and storage of welding materials shall meet the requirements of JB/ t3223-96 welding materials quality management regulations and related standards.

5. The argon tungsten arc welding shall adopt the cerium tungsten electrode and conform to the provisions of GB4191 "cerium tungsten electrode for inert gas arc welding and plasma welding and cutting". Thorium tungsten electrode can also be used, but it should meet the corresponding standards.

6. The argon purity used for welding nickel pipe fittings shall not be lower than 99.96%.

7. It is advisable to use plastic hose for argon pipe during welding, not rubber hose or hose with other hygroscopic materials.

8. Similar ni-fe and ni alloys shall be welded with the same welding materials as the base metal alloy system. If there is no requirement of corrosion prevention, welding materials different from base metal alloy system can also be selected, but the joint performance should meet the design requirements.

9. The selection of welding materials for nickel pipe fittings shall be comprehensively considered according to the chemical composition, mechanical properties, service conditions and welding conditions of the welding parts.