Section - 13B: Pipe Fabrication Shop Assignment ...

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Just like to add a few things.

As far as ASME Sec IX goes, testing with Er70S-X and Carbon Steel Pipe with GTAW qualifies you to weld on both Carbon Steel and Stainless Steel pipes. Here is why:

Sec IX groups both base metals and filler metals into categories. Some rules within the code allow one group to qualify for other groups.

ER3xx and Er70Sx are both grouped together as F Number 6. The Code (Sec IX) specifies the following requirement for requalification:

QW-404.15 A change from one F-Number in table QW-432 to any other F-Number or to any other filler metal, except as permitted in QW-433. Since there is no change in F Number, you are good.

For the base metal, the code states:

QW-403.18 A change from one P-Number to any other P-Number or to a base metal not listed in table QW/QB-422, except as permitted in QW -423, and in QW -420. QW 423 groups quite a few base metals together, including Carbon Steel, Stainless Steel, Inconel, CuNi, and NiCu.

Here's a summary: If you qualify with SS Wire or CS Wire on CS or SS Base Metal, you are qualified for either, provided all other variables remain the same.

If you qualify with SS Stick Electrode (300 Series) on CS or SS Material, you are only qualified for SS Electrodes, but you are qualified for any base metal as allowed by QW 433.

If you qualify with CS Electrodes on CS or SS Material (not common), you are qualified to weld with only CS Electrodes (F4) on any base metal as allowed by QW 433.

Though you, the welder, are qualified, you will only be welding on materials for which a qualified welding procedure exists. That's a whole other set of rules.

As an inspector, when testing welders (if allowed), I have them test with CS to get the qualification done. Then I perform a workmanship sample on SS material similar to that used in production. Many welders who pass a 2" CS or even SS Butt joint will struggle with a 3/4" Schedule 80 SS Butt. Even though they are "qualified."

I've shown up on a job or two in my day and made a mess of a few welds, even though I had been tested and certified for that weld. But that's a whole other embarrassing story.

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