ASTM A234 includes seamless and welded pipe fittings
For the seamless steel pipe fittings refers to the fittings raw material from the seamless steel pipes and tubes;
Thus the welded steel pipe fittings covers the fittings raw material from welded steel pipes.
It shall be noted that,
ASTM A234 specification does not cover cast welding fittings or fittings machined from castings.
The manufacturing processes for pipe fittings includes forging and shaping operations. As well as pressing, hammering, piercing, extruding, upsetting, rolling, bending, fusion welding and machining. Or the processes of combination of two or more of these operations.
During the manufacturing steel pipe fittings, below activities shall be noted:
1, Injurious imperfections, welding defects shall be not created.
2, After shaping or forming the fittings in a suitable temperature, it shall be cooled in a appropriate environments to a temperature that below the critical range. And no defects shall be made during the cooling procedures. The cooling rapid shall be not more than in the air.
3, Suitable inspection shall be performed after manufacturing. (Hydrostatic test, hardness test, tensile test etc)
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