Welding properties of A106 pipe

Welding material: Select the welding material according to AWS A5.1 standard or GB/T5118, GB/T8110. If you choose electrode arc welding, bake it according to the standard of electrode before welding.

Process: The process includes welding line energy, preheating temperature, post-welding heat, post-welding heat treatment, etc. In the case of higher crack risk, especially when using submerged arc welding to weld A106 Grade C steel, it is recommended to carry out de-hydrogenation annealing at 200~280℃ directly after welding.

The annealing time should be at least 2 hours. For larger thicknesses, the upper temperature given and a longer holding time should be used. For partially filled welds requiring intermediate cooling, dehydrogen annealing is recommended before cooling below the preheat temperature to avoid cooling the weld below the preheat temperature. If, due to special circumstances, the weld has to be cooled below the preheating temperature, it is recommended to carry out a crack test on the partially filled weld surfaces before restarting the welding work.

If possible, grind the entire weld surface including the edges. In case of danger of cold cracking, it is not permissible to carry out non-destructive testing after the weldment has cooled down. The non-destructive testing shall be carried out after a minimum time lag of 48 hours.

Reference Standards:

ASME SA-A106

GB/T8110

GB/T5118