Reinspection requirements for welding electrodes in low-temperature vessels
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Clause 5.1.4 of GB/T150.4 stipulates that for welding electrodes used in low-temperature vessels, retesting of the moisture content in the coating or the diffusion hydrogen content in the deposited metal shall be carried out in batches, with the testing methods specified in the corresponding welding electrode standards or design documents. When manufacturing low-temperature containers, how does everyone in the industry proceed with this?
Measurement of the moisture content in welding rod coatings: 1. Weigh 10 welding rods using a balance and record their weight (with accuracy to 0.1 gram)； 2. Dry the welding rods according to the drying method specified for them ； 3. Place the dried electrodes in a desiccator while still warm and let them cool to room temperature ； 4. Weigh the welding rod ； 5. Calculate the water content.
What are the standards for measurement methods, and how is compliance determined?
This is for testing the amount of hydrogen diffusion, and there are specialized institutions that can carry out such tests