Full Penetration Weld needed?

[valkyrie77]

I have received question about the welding for the attached file.
Is a CJP needed here?

Thanks all for your kind opinion.

 

[JR97]

Valkyrie,

Not a CJP. The weld callout is for a bevel 'S6' deep. The balance of the plate thickness need not contain weld. After the groove is filled, an 'A4' fillet weld is added on top.

JR97

 

[valkyrie77]

JR97,
Thanks for reply.
However, there are some guys said a CJP is needed (not in the forum). This is the part that confused me.

If we leave the question aside, I wonder if a CJP can be achieved? I ask this because of past experience, that a CJP joint can only be produced with a gap set between the plates (am i right?).

Another problem is the thinner plate warps because of too high heat input causing the structure to distort.

Some data of the welding process:
V=35V
A=380Amp
wire feed speed=15.2m/min
travelling speed=350m/min
thinner plate thickness=8mm
thicker plate thickness=20mm

BR,
valkyrie

 

[hogan666]

valkyrie77,
It is possible to weld this connection and achieve complete joint penetration (CJP). There are many factors that first need to be considered. This is most likely going to be welded to a code. The code should define the requirements for welding and a welding procedure is probably a requirement. Most welding procedures fall into two categories prequalified or qualified by testing. I'm not familiar with the "S6" and "A6" meaning but where they are placed on the welding symbol denotes the weld size or depth of penetration. If there was no letters/numbers it would mean a CJP was required. Most code would require that if this connection was a CJP the welding procedure would be required to be qualified by testing.

 

[JR97]

I missed this on the last post. The weld symbol does not match the drawing. The weld symbol mandates the bevel be on the inside of the structure (side opposite arrow) but the bevel is shown pictorially on the outside (side of arrow).

Distortion aside, I suppose you could consider the bevel size to be a minimum and bevel the entire thickness of the plate. There is no reference to tolerance of bevels in AWS A2.4.

JR97

 

[valkyrie77]

Dear all,
Apologise for late reply as i've been busy with some other stuff.
The drawing is from Europe so there's no issue with the symbol (which is opposite with AWS)
The structure is design & constructed according to DIN (supposedly for cranes)
The bevel has been changed to 1mm balance x 45 deg. However, to achieve CJP, a quite high heat input is introduced to the structure. Which cause distortion.
Of course, there are other matters to look into. e.g.: the fit up, the plate dimensions....etc.
Should update you all if any solution's found!
thanks!