Bevels J and V 3

[engresague]

Hi,

May someone kindly explain to me the advantage of the bevel type J with respect to bevel type V, for circumferential welds on piping systems ?.

Thanks in advance for the attention paid to my question.

 

[fegenbush]

A V bevel will have an area to fill which increases linearly. For thick sections, this can cause an unnecessary increase in welding time and cost. A J bevel will achieve the required root access width with a minimum of additional welding required. The detriment of the J bevel is that is is more complex to create than the V bevel. These costs must be weighed to determine the most economical option overall.

 

[tbuelna]

A J-type weld differs from a V-type weld in that the J-type weld only bevels one side of the joint, while a V-type weld normally bevels both sides of the butt joint.

 

[RoboCop16]

As Fegenbush points out, on thick sections there could be an economic advantage of J-welds, as they require less welding.

Additionally, J-welds can be better quality, as the less welding means less heat input and hence the heat affected zone (HAZ) will tend to be smaller. In other words: Less heat damage to the work piece.

@ tbuelna: In the same way as V-welds, J-welds may be single or double sided.

 

[tbuelna]

terp16- Sorry if I used the wrong term. What I meant by beveling both sides of the pipe ends being butt welded was left/right and not inside/outside as shown in the link you provided. In this regard, a single-sided butt weld with matching J bevels either side of the joint is called a U weld.

 

[Duwe6]

"In this regard, a single-sided butt weld with matching J bevels either side of the joint is called a U weld."

That is indeed the correct terminology, per AWS. However, I have never heard it called that 'in the field'. Everybody [including Welding Engineers] refers to that joint as a "J-bevel". I try to use both when I am writing something, to avoid this problem.