Question: as stated in the header, and as a service to the Eng-tips community.
Let's examine the content, direction, moderation and decorum (or lack thereof) of recent climate related threads. I will kick this off but not participate. Knock yourselves out...
https://www.eng-tips.com/viewthread.cfm?qid=191359
I've been pondering options for the butter layer for an ultimately 316(L) corrosion-resistant weld overlay to achieve:
full 316 Cr-Ni-Mo chemistry in the 2nd layer (getting carbon down to 'L' range is very unlikely);
achieving a reasonable...
I'm having a very hard time overcoming my extreme initial skepticism about the rebound approach. The whole concept seems totally mickey mouse. (My weapon of choice for field testing has always been Microdur.)
Any experiences (preferably hands on) with this instrument? Limitations in terms...
Skyrocketing prices for met lab services are forcing me to consider setting up my own basic metallography capability. This would support failure analysis, so not an everyday tool, and it just needs to do the job: capture good quality images for evaluation and reporting purposes. The subject...
I am estimating a raft of mechanical testing for procedure qualifications (bends, tensiles and Charpys to ASME IX) and I am finding that prices have risen sharply in the past 6 or so years. In fact they are as much as 3 to 4 times higher, a bit of a shock for me and my client.
So I am asking...
I'm performing several routine WPQs to Sections IX, VIII-1 and B31.3, and I'm running into problems with B31.3 (where I have not spent that much time over my career). Charpy impact testing will be performed. B31.3 seems overall pretty sketchy on requirements for welding procedure...
Hi all,
I'm being pushed to build my own home met lab by sharply rising costs and increasing turnaround times of the labs I occasionally use. Most of my work involves carbon steel, often with welds, to support my failure investigations. Nothing that requires specialized tools or techniques.
I...
A complete dog's breakfast.
The title alone is exhausting.
It's enough to make me revert to stick welding.
.
Discuss.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
A long time ago a colleague ran a PQR for reformer material, IIRC it was some variation of HP-40. It wouldn't pass even a 15° bend, but I recall the Code has provisions for comparitive bend testing, where the extent of maximum bending sustained by the weld coupon is compared to that of the...
We are looking at modification of a large diameter, 3/4" wall pipe made of this Q&T steel. The task is local thickness reinforcement for a small diameter penetration. It is not pressure equipment.
Other than strict hydrogen control practice and preheat, are there any other precautions we...
We are attempting a crack repair on a large F22 forging (several tons I estimate), where the joint restraint is extremely high. The first attempt with TIG & SMAW has failed, with at least one of the SMAW passes showing centreline cracking.
My question is this: is the B3L filler any less prone...
The weld overlay cladding is 4 layers (~½") of Inconel on a carbon steel substrate. In metallographic cross sections we are seeing partially mixed zones with features up to ¼ inch in dimension, greater than our acceptance criterion. Everything is vertically situated within 0.05" of the fusion...
We are looking at orbital welding to replace previously used SMAW for a number of thick-wall joints in carbon and low alloy steel, up to 24"OD x 4"T. Quality is at an extreme premium.
In my first cut analysis I came up with the following concerns:
1) At what dimension does narrow-gap become...
I have scoured the interweb and read applicable sections of the B&PV Code, but I am having trouble comprehending both the logic and the techniques used for determining RTndt. Is there a single reference source that explains all of this (and proves to me that it is not all one massive fudge)...
thread177-139287
I understand the differences between Class 1 & Class 2 of Grade LF2 in terms of minimum Charpy impact energy and test temperature.
What is the difference in heat treatments implicit in the requirements (or, it is not implicit but just based on practice)? Para. 5.4.2 lists...
I'm looking to learn more about this test, about which I can only find sketchy information on the interweb.
I understand it is applied to HSLA and low alloy steels and seems designed to forced HAZ cracking.
Is it still used, and how useful is it?
Thanks in advance.
.
"If you don't have...
Looking for the susceptibility of these steels to temper embrittlement, particularly 410S. In principle it is possible, but I've been unable to locate hard data.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
IMO these changes will create an unholy mess, and are a horrible solution to a problem created by the codemakers themselves. It will cause upheaval if ASME accepts it.
http://weldwell.com/aws-changes-standards-for-welding-consumables/
I hope there is an upside, but at first sight I don't...
I attach a few photos of a failed refinery reboiler tube that has me puzzled.
Description: ¾"Ø x 16GA (0.062"), arc welded 304L. Chemical analysis of base metal is in spec, although P is surprisingly high at 0.034%.
Service: Tubeside steam, shell side cat cracker feed (heavy hydrocarbons)...
We are looking at upgrading the metallurgy of a reboiler exchanger. Tubeside process fluid contains 97% Isobutene, 2.5% Isoprene with sprinkings of C2~C6 hydrocarbons (-enes, -ynes, -anes). It also contains methyl chloride (MeCl) at nominally 0.03% and t-butyl chloride at nominally 0.02%...
