4.7　Welding Consumables

4.7.1　Suitable welding consumables shall be selected based on chemical composition，mechanical properties and weldability of base metal，considering construction features and welding processes of the tanks.

4.7.2　Welding consumables shall be provided with certificates of quality，and satisfy the requirements of the applicable codes and standards.

4.7.3　The welding consumables recommended for commonly-used steel grades shall satisfy the requirements of NB/T 47015.

4.7.4　Generally，the welding consumables，which have good cracking resistance and match with the materials of lower strength，should be used for the welds between carbon steels，low alloy steels with different strength classes.