Use of Eddy Current on 6061 AL

Date 04-04-2008 17:39

Code: D1.2 (2003)
Application: Class II tubular structure
Material: 6061-T6 2x2x3/16" square tube
Process: GMAW, DCEN, ER4043, pure argon

We build a ton of these. One of our customers wants to perform in-process sample NDI and he's considering using eddy current. I'm not familiar enough with the process to understand how it will be used on this structure, which is about 80% fillets and the other 20% PJP grooves. My argument might be that this process will produce a lot of indications which are in the acceptable range of the code.

Any takers?

By bozaktwo1 (***)

Date 04-09-2008 16:52

Wow, I guess not. Maybe if I copy this to the Inspection section...?

By NDTIII

Date 04-10-2008 04:30 Edited 04-10-2008 04:32

Eddy Current would work fine on the structural part, but on the welds I would recommend Flourescent Water Washable Penetrant (FP) because of the rough surfaces on the welds. Penetrant will give you a definte yes or no.

By bozaktwo1 (***)

Date 04-10-2008 16:39

This was my general thought as well. I'm trying to see where the customer's inspector is justifying the use of the eddy current to check the welds. IMO, it will bring out too many indications which are acceptable by the code.

By NDTIII

Date 04-11-2008 10:34

Unless the welds are as flush as the base material, you will get edge effect. You may also get eroneous indications from the HAZ. Trust me. FPT is more than adequate.