1999JB/T 9186-1999 Welding procedure specification for CO2 shielded arc welding
1970JB/Z 286-1987 Carbon dioxide gas shielded welding process regulations
JB/Z 286-1987 Carbon dioxide gas shielded welding process regulations was changed to JB/T 9186-1999 Welding procedure specification for CO2 shielded arc welding.