Iron Plate, ASTM A129 1

[TangoCleveland]

I'll be posting this in several areas. We have some old welded pipe fabricated from iron plate, ASTM A129. This standard was withdrawn in 1966 with no replacement. The 1947 spec says it's very ductile, 25% elongation in 8". Has UTS of 44 ksi and YS of 27.5 ksi. We're trying to decide whether we can weld carbon steel to it, but we don't know what P-number the iron would be. Has anyone had experience with A129 flange quality iron plate?

Larry

 

[metengr]

This is most likely a C-Si, firebox quality steel plate. I was reviewing a 1952 Edition of ASME B&PV Code, Section I last night for an acquaintance that is considering weld repairs to some historical steam traction fireboxes. I recall that the lower strength carbon steel had a min UTS of 44 Ksi.

I would consider this material as P-No1 Group 1.

 

[unclesyd]

The 65 Code shows it to be a P-1 material.
Up to 650°F

The allowables are
A: 10,000/40,000 Ts
B: 11,000/44,000 Ts
C: 10,500/42,000 Ts

 

[TangoCleveland]

Thanks for the documentation suggestion, unclesyd! Should have checked myself. Our copy of 1962 Code verifies it. We'll be ready to weld the A129 iron in April.

Larry

 

[RockinRoy]

I am reviewing the design of a vessel that was built to the 1952 Edition of the B&PV Code. The U1A form shows that the longitudinal and circumferential shell welds had 100% RT, but the joint efficiency is 90%. Can anyone tell me if, back in 1952, the Code required a joint efficiency of 90% for 100% X-Ray?

 

[metengr]

Well, in my 1952 Edition of the ASME Boiler and Pressure Vessel Code, Section I titled, "Power Boilers", there is reference to fusion welding ....

P-102
.... a welded joint efficiency of 95 percent may be used provided all weld reinforcement is removed substantially flush with the surface of the plate. Otherwise, a joint efficiency not to exceed 90% shall be used.

The above paragraph is used in context of a full (100%) volumetric (RT) examination of the plate welds.

I don’t have Section VIII, but at that time the Code committees tended to parallel each other.