Section IX never tells you when you have to do impact testing on a PQR, only how to do them when required. So the construction code will tell you when impact tests are required. However, I don't know of any construction code requiring them, and Section IX doesn't have any rules on how to...
Sand castings between 50 & 800 lb are within the capability of many, many foundries in the US, depending on the material being cast. Cast iron, steel, stainless steel, bronze, etc? I do not think it would be hard to find a domestic foundry that could make these. As mentioned though, if they...
Your QC department statement is correct (they would have to be since they are basically quoting Section IX), however, they are applying it incorrectly. I would hardly call welding 304L base metal with 308L filler metal indiscriminate since that is what happens every day in thousands of shops...
1. AWS does not state a limit to my recollection.
2. PWHT for AWS D1.1 is at the discretion of the engineer. AWS does not specify it. Manufacturers of A514 do not recommend PWHT though.
Essential variable for welder qualification or procedure qualification?
For welder qualification, it is an essential variable if the electrode does not have an F number.
For procedure qualification, it is only an supplementary (impact testing required) essential variable if the electrode...
qcrobert,
It does not appear that what you are describing as buttering will provide any metallurgical transition, or have different essential variables than the rest of the joint. That sort of weld deposit should be qualified as buildup instead of buttering, and can be qualified with a standard...
You can't PWHT CA-15 hot enough with the ER410NiMo filler metal to meet sour gas (NACE) requirements. Either the weld metal or the HAZ will be too hard. ER410 is the filler metal you need to use. If you are the casting manufacturer, A488 would apply. It appears you are the end user though...
Some aluminum alloys have cracks in the melted portion of a thermal cut. The specification was most likely written so guarantee that any potential cracking is removed. Even if your part is adhesively bonded, the pre-existing cracks on a thermally cut edge can act as a stress riser that could...
If mechanical properties are required for weld overlay, the welding procedure can be qualified as overlay and in addition, qualified as weld buildup (using dissimilar metals), or even buttering, in accordance with Section IX. Of course it is probably too late for that on an existing vessel...
I have had the same problem before, and never could find one that met the AWS class. If you can use it, how you handle it depends on what welding code you are working to. If you really need a classified wire, can you try a metal cored or flux cored wire? It is easier to find those as the...
A word of caution if you end up using the 410NiMo, the final PWHT temperature should not be "in the range of 1150F", but should be 1150F maximum. This is because the lower critical transformation temperature is not much above 1150F.
By "check cracking", are you referring to what is also called "chevron cracking" because the cracks are often at 45 degree angles? If so, that is generally a hydrogen related problem associated with high strength weld metals, which P91 could be considered as it is definitely sensitive to...
From AWS D1.1: Acceptance criteria for ASTM A 514, A
517, and A 709 Grade 100 and 100W steels shall be
based on NDT performed not less than 48 hours after
completion of the welds.
I agree with gtaw, for the same weld volume, more passes (lower heat input per pass, but more heat input overall) will cause more distortion or movement.
Brimstoner: some additional things to consider
From the tone of your posts, I would guess that you are the material manufacturer/foundry. Is that correct? I am just guessing here, but if you were, you would probably be solution annealing/water quenching daily. If you are not the foundry, you...
Some companies require PQRs that simulate repair situations, with the original weld on the PQR repaired for as many repair cycles as desired to be qualified. However, this sort of requirements is well in excess of ASME Code requirements. If your client wants something like this, they need to...
Have you looked at this as a potential specification for ordering?
ASTM A915 / A915M
Abstract
This specification covers carbon and low alloy steel castings having chemical analyses similar to that of the standard wrought grades. Several grades are covered, such as; SC 1020, SC 1025, SC 1030...
DVWE,
Yes, I have personally done this and seen it done by others. The main situation I have found it advantageous for is repair projects. If you are doing a bunch of repairs that do not require PWHT, but then later, a find one that requires PWHT, you don't have to go back and question all the...
