indication of preheat welding

[gil]

Hi.
are to ask if there is any norm or custom on the correct method to indicate the preheating temperature of an element, before welding. I reread the uni en 22553 symbolic representation of welding. but I didn't find anything about it. How do you behave? I usually write it brutally near the drawing, but maybe I could do better.

 

[meccanicamg]

It would be necessary to draw the wps i.e. the welding procedure, but it is a page. I think the indications next to the welding note is the best and practical thing.

 

[gil]

in the company we have certificate of wps.
I could put a reference to those. I doubt that I can give the welders a plic of wps and tell them every time to look for the corresponding file.
but the general designer, who does not know which company will carry out the work, and therefore cannot refer to specific wps how should he write it?

 

[exxon]

this is a good problem that should be brought to the knowledge of the iso committee (or en...) that deals with the drafting of specific rules. . .

what appears strange is that the rules on the indications for welding have been updated not long. it's strange that nothing has been inserted about it, but i've never seen it.

 

[PIETRO2002]

in theory each serious company should have its own wps, where there are all information related to the welding process, to the welding driver's license etc., then on the drawing the number of wps should be reported, the problem arises when the welding is carried out with third parties, the tertiary company that makes the welding should issue a sort of working cycle with indication of their wps?

 

[meccanicamg]

in theory each serious company should have its own wps, where there are all information related to the welding process, to the welding driver's license etc., then on the drawing the number of wps should be reported, the problem arises when the welding is carried out with third parties, the tertiary company that makes the welding should issue a sort of working cycle with indication of their wps?

in practice it is never done in theory in this case the third welder has to do the wps....but if you don't pay it doesn't write it to you... if you're okay it says it in voice and then....do as it pleases.

 

[gil]

ok the wps, but if you are a design studio, without internal workshop.
If you do a piece that will then realize who knows, you can't know the wps, because you still don't know who will do the piece. but the welding you have calculated how you describe it?
Perhaps the preheat depends on the business tools (from the wps) and therefore is not considered this factor in the project phase?

 

[PIETRO2002]

the design study calculates the size of the welding, but for work of a certain delicacy and importance, or the designer has good knowledge, or you have to rely for the welding specifications to the specialized technicians, see the iwe figures, iwt, iws and iwp (see Italian welding institute site ).
the preheat normally depends on the materials to be joined and the material of contribution, this is a field where you need knowledge and experience that the qualified technicians, mentioned above, surely have.

 

[PIETRO2002]

In theory, during inspections, the welder should have at hand the wps for the welding he is performing, should have calibrated the welder, with the parameters indicated on the wps, with the wire or electrode of exact section and of exact material. .
utopia? ?

 

[gil]

thanks to all for your suggestions. Now I'll be right on it and try to put things together.

 

[320i S]

quoto Meccamg, wps and cite it in the drawings.
so if you have to change the process, you do it on the wps and you do not have to update all the designs.

 

[320i S]

ok the wps, but if you are a design studio, without internal workshop.
If you do a piece that will then realize who knows, you can't know the wps, because you still don't know who will do the piece. but the welding you have calculated how you describe it?
Perhaps the preheat depends on the business tools (from the wps) and therefore is not considered this factor in the project phase?

depends on what you agree with the external study.
If you only need to provide the project, the study is limited to putting in the drawings the design part (and in this case, only the complete welding symbol, no procedures or specific notes for the production of the piece), in this case, will be the contractor of the project to have to complete the parts inherent in the production. if, on the other hand, it must also provide the part of industrialization, it must also have the procedures of the customer.