full penetration welding

[robyengIT]

In Italy, when you have a full penetration weld, you are not obliged to calculate the weld but only the section of the structure considering it as a laminated profile. Someone says that this is valid also for a "T" section : my opinion is that the full penetration weld is IMPOSSIBLE for such a section unless you use 3 flat plates (and this is absolutely stupid)
Any comment will be appreciated. Thanks

PS : reference to any standard is welcome

 

[MotorCity]

Not sure what you mean by a laminated profile, but if the full pen weld can develop the strength of the section then it need not be checked. Maybe post a sketch if I am missing something

 

[robyengIT]

laminated profile : produced in the steel mill.
What I don't understand is : how it is made the full pen weld in a T section ? May be for the web, but for the wing ?

 

[racookpe1978]

1. Sketch how you think the full penetration weld prep for a T-joint should be made.

2. Any weld "can be" checked (verified free of detectable flaws by NDE, I assume you mean). Whether it has to be checked is determined by the Code, the service, the client and insurance rules, the conditions and loads on the weld.

 

[MotorCity]

robyengIT - you can achieve a full pen weld in a Tee section by beveling the stem of the Tee where it attaches to the flange (use 2 plates)

 

[DAVIDSTECKER]

Depending on the steel thickness we double bevel (45 to 60 deg each) the edge of the plate with a small flat left on the tip, then lay in a root pass and a few added passes.
Then grind out the root pass from the other side of the plate, then weld that side.
Switch sides as required to keep the joint square.

 

[robyengIT]

full penetration weld : as per attached sketch (red outlined) the two possibilities (how it is meant in Italy).
What is the substantial difference from the fillet weld (blue outlined) ?

MotorCity & Davidstecker : would You be so kind to post your sketches ?

 

[MotorCity]

The weld in the red box is a full pen weld. The weld in the blue box is a fillet when, and unless it is a rather large weld, it most likely is not going to develop the full strength of the steel section as the full pen weld.

 

[weldstan]

As per MoterCity, the full pen welds are shown in the red box. These welds would be supported with reinforcing fillet welds. The single bevel weld would either be backgouged to sound metal and welded or the initial pass weld would be made with a process that would provide full penetration. The double beveled joint would be backgouged/ground to sound metal and back welded to achieve full penetration.

 

[DAVIDSTECKER]

Put me under the RED box column.

 

[gtaw]

Some people get twisted up in terminology.

Think of it this way, a groove weld goes in the joint and can be either a partial or complete joint penetration weld.

The fillet weld, in contrast to a groove weld, goes on the joint and only needs to have fusion to the root. A fillet weld does not need to penetrate the joint.

A groove weld, which is in the joint (just another way of saying it penetrates the joint), can be either partial or complete joint penetration. The groove weld can also be reinforced with a fillet weld "on the joint."

Best regards - Al