Yes.
You may butt weld two pies with the plain end, i.e. 0-deg. But, the the joint quality factor (Ej) of the pipe will be reduced per B31 Code, which may not be aceptable by the engineering design.

Ej is for long seams/helical seams, it does not apply to circ welds (pipe to pipe).

That's because there isn't one.

The bevel angle is noted in the weld spec. If you try to weld square end pipe when the WPS calls for 37 degrees bevel then you are not following the WPS and your weld will probably fail the NDT.

The supplier doesn't know what you want the pipe for.

So the angle is part of your pipe specification/ data sheet.

BTW "...the ASME" is meaningless without at least the particular code number.

This question is all a bit silly as no one will weld pipe end like this

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for a butt weld the usual angle is 37.5º

luis

That's an included angle of 75°, which looks like a lot to me. Dependig on material and welding process, it can be OK, but I would not use this as a "general" rule-of-thumb.

kinginero

of course it depends on the thikness but the usual is whate I said

This is from ASM B 31.3.

Most bevels you see machined into pipe is probably 37.5 degrees with a small flat root as it is easy to cut or bevel.

But you do need to specify it on the pipe data sheet.

As the diagram says - these are "typical" - but they are a general ROT for the petrochem industry at least.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

The pipe manufacturer must provide finished ends per the applicable pipe spec. Usually beveled for smaller thin pipe and square cut for larger/thicker pipes.

Same goes for BW fittings....ASME B16.9 has dimensions for bevels.

Quote (0707)

kinginero

of course it depends on the thikness but the usual is whate I said

Should have mentioned location or region also as a contributing factor, apart from material and welding process...
The range 60° - 70° is what is used outside the USA, seldom any more.