14:42 Apr-17-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to Atif Nadeem at 12:48 Apr-17-2019 (Opening).
Due to geometry echoes coming from the backing strip may be misinterpreted as signals from the weld defects - this is a typical problem for conventional UT, in case of using PA modality it is mostly resolved
00:24 Apr-18-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to Atif Nadeem at 12:48 Apr-17-2019 (Opening).
Who told you the bottom 3-5mm could not be inspected? This would imply that, for example, on a 3/8" (9.5mm) weld, the bottom 1/3rd to 1/2 could not be covered. This is quite strange.
Even with a backing bar this is not an issue. I actually find that backing bars make things easier because the far side root fusion is usually a more consistent reflector than if you are trying to rely on the root protuberance alone.
10:29 Apr-18-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to ~John Pitcher at 17:50 Apr-17-2019 .
I totally agree with John's opinion. Inspection of a V welds with backing rings follows the rules of a normal V joint, with the specificity of backing.
The use of a PA technique like Daniel says facilitates, as always, this inspection. Naturally, must be considered UT ispector with the same technical background on ultrasonic techniques.
When the assumption of confidence with the UT techniques was not so high, the UT inspector for butt-weld joint had to pass a specific examination for this configuration otherwise it was not enabled to inspection and sign the report. Just to give an idea!
11:17 Apr-18-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to Mario Talarico at 10:29 Apr-18-2019 .
With reference to the very certain sketch presented by Atif along with raising a question
I presume that this is a screenshot was not invented by Atif but taken out of some procedure. And the possible reason behind is that the authors of the procedure had a doubt about the operator's ability in performing the reliable on the spot interpretation based on the signals that they (the authors) observed at the time of preparing their procedure. In past the literature related to the conventional inspection of the welds with backing plates, rings noted the ways to distinguish the defect echoes and geometry echoes but at the end everything depends on the operator's skills and concentration while performing the inspection
08:20 Apr-19-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to Atif at 11:46 Apr-18-2019 .
In the past UK operator certification for manual conventional ultrasonics required that 50% of plate butt welds to be inspected were with backing strips. I recall they were generally easier to discern good penetration and fusion in the root than welds without backing strips. Welders liked backing strips as they could increase the ampereage to ensure full penetration and fusion without danger of burnthrough.
21:07 Apr-19-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to Nigel Armstrong at 08:20 Apr-19-2019 .
In thicknesses starting from 6 mm for welding plates until about 14-16 mm , the WPS sketches have a gap in the root pass of 6 to 8 mm to facilitate penetration with non-manual welding. The width of the root gap in these cases facilitates signal resolution and avoids being enchanted by geometries.
I do, however, experiences with large diameters tubes where I found the root passes with systematic LOF problems: but I consider it an exception.
In any case, representation of the root pass, imagining the root gap constant, must consider the variation of 2 geometric variables: variation of the distance between backing strip and component to be welded; misalignment between the bevels. Only starting from this can we imagine and simulate realistic interasions between geometry and the defect reflectors.
I agree also that root fusion does not normally create problems (I almost always found LOF in the welding body, even several meters long and on both sides, due to the welding procedure used).
The penetration of the beam in the backing strip creates reflections from the backing strip edges, with acoustic paths similar to the reflections of the defects in the body weld.
Do necessary checks, and do not bite!
Clair D'El Rei NDT Inspector, I am looking for a new opportunity in the labor market and I accept proposals from other countries i, Brazil, Joined Feb 2019, 15
Clair D'El Rei NDT Inspector, I am looking for a new opportunity in the labor market and I accept proposals from other countries i, Brazil, Joined Feb 2019 15
16:55 Apr-20-2019 Re: why 03~05 mm area in single "V" weld joint not inspected?In Reply to Atif at 08:04 Apr-19-2019 .
It has now become easier to explain to you, as this sketch is part of a report, in my opinion, the inspector who performed the test demonstrated the sweeps performed during the test and the limit of verification of weld penetration at the inspected joint and which was only the effective throat required by the soldering procedure.
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