WPS Ranges

Date 10-14-2010 20:37

I had a WPS (D1.1) written for a project that I was working on and within the wps where it requests the amperage range the author of this wps entered the manufacturers suggested range for this electrode. During an inspection of the paperwork we were told that this area was incorrect. Can anyone please explain to me how this works. This is quite new to me.

Thanks,
Chas.

By welderbrent (*****)

Date 10-15-2010 04:07

The first thing I would look at with the information available thus far is rather the electrode size the WPS was written for matches the electrode size from the manufactures suggested range. Is it possible someone didn't match the sizes properly? If they read the MSR for 1/8" and wrote a WPS for 5/32 you would be slightly off.

Also, some engineers/customers have no true reason for their rejection. They may want a tighter range (125-130 instead of 115-150 for example) with nothing to back up personal wants.

Just my two tin pennies worth.

Have a Great Day, Brent

By js55

Date 10-15-2010 10:32

If your working to AWS you have to limit the amperage to + or - 10% from either a qualified or prequalified arbitrary limit.
If your working to ASME the manufacturers recommendation is a who cares.

By 877412

Date 10-15-2010 03:47

The person who wrote the WPS is correct. The manufactures range is proper for the WPS. See D1.1 -2010 Table 3.7 Now there could be some differences in each manufacturers specifications but it would not vary much --and that could be due to the alloy variations in flux or base wire.
Also , if you are referring to a Procedure Qualification Test Record (PQR) for a non prequqalified weldment then your person questioning would be correct as the PQR does require the actual amperage used for the test plate .

K Karwowski

By fschweighardt (***)

Date 10-15-2010 14:53

If you are working with D1.1 2010, and it is a prequalified procedure, Table 3.7 (Requirements) makes you keep the range within Mfg's recommended parameters. Table 3.8 (Variables) does not list a change in amperage as applying to the SMAW process

For qualified by welding procedures (Table 4.5) says you cannot go outside the range listed by the Mfg.

If this procedure has a CVN requirement, you have to look at the heat input formula and your PQR. The max HI on the PQR is the max qualified on the WPS

By js55

Date 10-16-2010 11:42

Yes.

By fschweighardt (***)

Date 10-18-2010 03:22

for SMAW AWS D1.1 2010, I can find no restriction other than Mfg's ranges

By js55

Date 10-18-2010 13:39

I stand corrected.