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Splicing Large Plate-Girders by Complete Joint Penetration (CJP) welding 2

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Catee

Structural
Jan 11, 2024
6
TH
Dear All,
In general, we plan to perform a bolted splice connection for the large built-up section steel structure. I have a question regarding the possibility of executing a splice connection using the complete joint penetration (CPJ) welding method. The attached image illustrates a bolted splice connection. If the contractor wishes to change the connection type to a complete joint penetration (CPJ), is it feasible according to engineering principles? Moreover, does it ensure structural safety? The mentioned structure is a portal frame with concrete columns and large box-section steel beams as the crossbeam. This structure supports the guideway beam of a train monorail system.

Please find the attached link for detailed drawings.
The figure below shows typical welding detail proposed by the contractor.

welding_type_rpo9aj.jpg
 
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There should be a detail showing the weld prep of the plates (there needs to be a throat gap) and there should also be a written weld procedure.
You need to be dogmatic about the weld procedures.
They should cover all of the details from preparation and pre-heat through welding and post-weld testing.
It should also address how the process has been qualified, how welders will be qualified, and the NDT that will be used.

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P.E. Metallurgy, consulting work welcomed
 
The weld callout has at least the following errors:

It's on the wrong side of the leader. It's drawn on the "opposite side", but graphically the weld is on the "arrow side".

The weld symbol is for a single bevel groove, while the graphic shows a single-V groove.

The weld symbol is missing the callout for the backing shown on the graphic.

The 8 is unnecessary and meaningless for a CJP weld.

The "all around" symbol might be ambiguous - I haven't taken the time to look at the attached drawing of the bolted splice long enough to figure it out fully.

This configuration is "prequalified", but you should probably qualify it and any welders anyway.

In concept, I'd likely be happy with a CJP weld splice. In practice, I'd worry about the ability of the organization that made this detail to execute it properly.
 
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