What is the minimum number of fields to be analyzed for ferrite point count for duplex stainless steel weld metal per NACE MR0175. This specification does not indicate this in Par. A.7.3.
The laboratory performed face and root bend tests at full thickness, (i.e. 1/2 inch), instead of 3/8 in. as specified on material with greater than 20% elongation. Instead of bending the specimens with at 1.5" diameter, they were bent with a 2" dia. to obtain the same outer fiber elongation. I...
I have two potential weld repairs.
Repair No. 1: I have welded a Category A joint with the SAW welding process. It was determined by UT that there is linear indication about 1/8 in. under the service and about 2 in. long. I was considering repairing it with FCAW, however since it is Category...
I have a 3 in. thick welded test plate and am required to perform rounded transverse weld tensile specimens in accordance with B4.0. Per customer requirements and based on the thickness, there are two sets of multiple test specimens that need to be performed at two different locations. The...
I am qualifying two production welds. Weld No. 1 is a CJP double-bevel groove meeting B-U5-GF of Fig. 2.4. Weld No. 2 is a PJP square butt weld that does not meet any of the joints in Fig. 2.5. Does the CJP groove weld qualification qualify the PJP groove weld qualification per Par. 5.9.1 or...
I am qualifying a test plate that has a variable double-V groove that has a groove depth of 1 inch on one side and 6 inches on the opposite side. Per Fig. UG-84.5 and Table UG-84.6, two set of HAZ impact specimens shall be removed from a depth of between (1/4)t to (1/2)t from each weld surface...
A welder welded a performance qualification on a 1/2 in. thick pipe, using a min. of 3 layers. The qualification did not undergo RT. Is he qualified for the max. thickness to be welded?
I am joining 4130 to a P1, Gr. 2 carbon steel. Impact testing is required. The 4130 base metal was impact tested to meet 37/25 ft-lbs. The carbon steel was impact tested to meet 18/12 ft-lbs. Why do I have to impact test the 4130 HAZ to meet 37/25 ft-lbs. and the carbon steel HAZ to meet...
I am qualifying a welding procedure to weld a 4130 nozzle to a forged carbon steel case in production. The min. tensile requirement shall be 70 ksi and impacts shall be tested in weld metal and 4130 to MDMT of +20F. I plan on using a -20F certified FCAW and GTAW carbon steel wire and PWHT at...
I am trying to determine the number of HAZ impacts to be taken in accordance with the new edition of the Code. I typically qualify plates that are 1.5 inches thick with a partial penetration groove of 3/4 inch. Fig. UG-84.5 seems to specify CJP welds with "t" being the base metal thickness...
I am reviewing a welding procedure that was qualified using a 0.28 in. thick test plate and was welded with short-circuit GMAW for 1/8 in. and pulse GMAW for the remainder of the thickness. In the WPS, is the base metal thickness qualified restricted by QW-403.10 or is QW-451.1 required to be...
I have feet that are to be welded to a pressure vessel. The feet are contructed of plate material and is to be welded to a forged pressure vessel. The weld symbol calls for a partial penetration single-bevel groove weld with a depth of 3/8" with a fillet reinforcement of 3/4". Is the...
One of my vendors wants to preheat using coke gas for a P1 welding procedure. I have never heard of this gas being used for preheating. What are some of the advantages and disadvantages of using this gas as opposed to natural gas preheating?
I have welding procedure of 4130 base metal that was buttered with an A No. 1 filler metal before welding to a stainless steel plate. Can I use a buttering portion of this qualified procedure to perform a production weld repair on 4130 material?
Does this paragraph apply for full penetration welds only? If I have a 1.75" thick base material and I weld a 3/4" partial penetration groove weld for a qualification, do I have to perform two sets of weld impact specimens?
UCS-67 states that the welding procedure qualification shall include impact tests of the weld metal and HAZs in accordance with UG-84. UG-84 states each set of HAZ impact specimens shall be taken across the weld...(UG-84(g)(2)). If I am joining a P1, Gr. 1 to a P1, Gr. 2, then two sets of...
Hello,
I was wondering if someone can help me out with this scenario. I have a compressor case that needs a weld repair to fix some mis-machined dimensions. The MDMT is -20F and it has to meet NACE MR0175. SA-352 is exempt from impact testing to this Div. in accordance with Fig. UG-84.1...
A vendor is welding a bevel groove weld on dissimilar metal thicknesses and has submitted this SWPS. One thickness is 0.145" and the other is 3/8". The weld metal thickness is 0.145", so it is a partial penetration weld. He is qualified for the base metal and weld metal thicknesses, but he is...
