need some help

[Facrupe]

Hello
first of all, my main job is not welding, but recently i took over a project that includes a lot of welding of stainless steel plates.

It is a pit to avoid spills of chemicals to the ground. The original construction did not have leakeage proof seal, so the decision was to make a SS basin under the machine and tanks.

But since this an enviromental sensitive issue, I want to make sure all the weldings are leak proofed. Some years ago, we made something similar, and the maintenance guy at that time, came with a test that is 3 cans of spray, one for cleaning, one red and one white. First he cleaned the surface with the cleaning spray, then used the red colored one, finally the white one. In the parts of the welding where there were leaks, the red color showed over the white one.

Do you know about this product? I need the name or manufacturer in order to make the tests for this new project.

Thanks

 

[Pat4d]

I believe it is called Dye Penetrant. We used it some years ago on some stellite weld inlays.

 

[chiefdruid]

It is called Penetrant Flaw Detection (PFD) and i used it when i was in the Raf, one of the suppliers i found on the net is here, http://www.marktec.co.jp/e/product/ndt/pt/penetration/eco_check.html i have not used there product
The technique is to apply the die, and by capillary action it is drawn into the fault, after a set time you clean of the excess die, leaving a perfectly clean surface, then spray on basically French chalk and this draws out the die, giving you an indication, not always a fault, but with a weld it is not always so easy to clean off and can give false indications, so you have to be very sure you clean off the excess die. before applying the french chalk.

It is a very simple and cheap technique, but to get good results it has to be carried out with great care

 

[Facrupe]

Thanks guys....this is what I am looking for.

Merry Christmas and Happy New Year

Regards from the far, far East