This standard specifies aluminum and aluminum alloy pipe fittings with seamless and longitudinal joints (hereinafter referred to as pipe fittings) that are attached to aluminum and aluminum alloy pipes by butt welding.
JIS B 2321:1995 history
2009JIS B 2321 AMD 1:2009 Aluminium and aluminium alloy butt-welding pipe fittings (Amendment 1)
1995JIS B 2321:1995 Aluminium and aluminium alloy butt-welding pipe fittings