The 3,5mm (10/2 - 3/2) of land either side of the root bevel on the lower face (in the diagram) may be difficult to achieve good fusion. As is often the case, if it presents a challenge to the welder, then it will present a challenge to the UT tech as well. Of course if the very best welders and...
With the uneven weld prep and the lower part with 10mm of land, I think the 1st question is can it be reliably welded with complete penetration and fusion?
Typical demonstration of quality for tube-tubesheet welds is to perform test pieces in the same manner and then section them. Problem with NDT on production welds is access (and cost). Have you a problem with leaks?
Hi Scott
" ...able to get through BINDT titled Magnetic particle inspection of precipitation hardening type steels written by C R Preston. It was originally published December of 2002 in Vol. 44 No. 12 of Insight."
Where are you based? Have you tried to obtain a copy from BINDT, Northampton...
Slip-on flange should not require RT or UT because of the geometry being unfavourable to both. Surface crack detection (MPI for carbon steel, penetrant for stainless) shouls suffice.
Please take the sage advice of metengr and have the parts tested professionally by a nationally-approved test house which has the right personnel, equipment and approvals.
Both Rockwell and Vickeers will leave macro surface indentations. Equotip (or some similar comparable equipment) should...
Your first post refers to welded parts. What size and shape are they? What equipment do you have and is it portable or fixed?
The advantages of the 2 systems I mentioned are they are both portable and both widely recognized hardness test equipment.
I concur with metengr, you need qualified...
http://www.ndt.net/article/0498/ginz_wel/fig1028b.gif
On this diagram (of a compound weld) there is a clear difference between what I term missed edge (LFS cap) and undercut (U/c Cap). I am an NDE guy but not a welding engineer but I believe the former has a different cause than the latter, and...
In this specific case and my general parlance, where the capping run adjacent to the parent material has left a small (circa 10mm long) unfilled zone with the weld bevel. Instead of an even geometry pass, at this one point the bead narrows and doesn't even reach the bevel. Hope this explains -...
In such case is a repair called and then proceed as per the repair procedure (and added to the repair rate) or is the repair welder authorized to grind open the missed edge, MPI and then manually fill out, followed by a pull of the line so that weld is in the AUT bay and the touch-up/weld repair...
QC7
"Fe" denotes the wires used are of low carbon steel, "SS" that the wires are of stainless steel (CrNi). These materials have different radiation absorption characteristics. You write that they "...are in the same group" What do you mean, from where do you take your information? Make a...
demsha
Your post heading "LOF after galvanisation" is erroneous if NDT (UT and MPI) was suitable prior to galvanisation.
If items were proven to be defect-free prior to galvanisation then I suggest that metengr and gtaw are likely correct and these are not LOF defects.
Of course there is...
http://www.twi.co.uk/technical-knowledge/faqs/structural-integrity-faqs/faq-what-is-the-relationship-between-charpy-impact-energy-and-charpy-lateral-expansion-for-ferritic-steels/
this gives an empirical relationship and a graph between impact value and lateral expansion
What's the form of the component - unlikely to be pipe at 50mm wall thickness. So if there is access to the root face and you have let the joint cool down, then visual inspect to check for lack of penetration/root condition followed by MPI for any lack of fusion. follow this by manual UT from...
Googling brought this response from the Hendix Group website (always informative):
"Depending on the configuration of the finned tubes, you might consider boroscope inspection. Ultrasonic wall thickness (IRIS) inspection may also be a possibility, depending on the diameter of the tubes. Finned...
tigwired
1st as both unclesyd and JR97 point out all welds requiring full UT should be examined by a comprehensive inspection plan designed with critical areas in mind (sidewall, root, toes of weld cap and HAZ) as well as a general examination of the body of the weld. This demands the use of...
lganga
What is your acceptance criteria?
If your deposited weld metal is ferritic and 30mm thick then perhaps you should investigate TOFD. The 3mm 316 cladding should not interfere significantly. If you apply ToFD ensure your techncian makes full allowance for the cap width (his examination...
Sorry members, but the search function is malfunctioning when I tried to search for any previous threads on this topic.
Does excess weld root penetration lead to life-shortening of process pipework through turbulent flow conditions? Has this been studied and recorded?
I am looking at the...
