Aren’t you supposed to use 2 90 degree inspections because the direction of the magnetic field you could miss a transverse crack or discontinuity running with magnetic flux lines. Turn yoke 90 degrees and test other direction for defect running vertically in weld . I would run it at 45 degree angle then another 45 so you are not putting probes directly onto weld where you could scratch or damage weld. He could easily miss a tiny transverse crack by not using 90 degree rule. Other than that his powder delivery was perfect along with his use of blowing tool. 👍👍👍
Hi Brad, you are correct regarding 90 degree rule. I did not perform the transverse as this was mainly to demonstrate you can do MT through coatings and the proper technique using the puffer. In general, I do not allow my technicians to do strictly 45/45 as I have seen people miss things due to less magnetic lines of force. I have seen no problems placing the poles directly on the weld or even adjacent as the lines of flux would still work.. Thanks for the comments!
Always fascinates me how I hear of things in my industry and overthink the simplicity only because I haven't seen it. Names can be daunting but are just technical terms.
I’m just a student. But getting a megnetic testing procedure booklet, you can buy them. And teach them the laws of physics of magnetic field, and how magnetic particles travel, if you have a crack the megnetic partical will act like a wind and travel downwards or upwards on a defect.
Thank you so much sir it's good practical sessions but sir one I asking one thing if you got any indication this method that yoke is continue on position and then check any indication have or not means conformation
Hi Daryl,I hardly check this and I should check the comments more often. There are several schools you could attend depending on where you are or find some companies like ours to train you. Hellier in so cal or texas is one. I think there is an online one based in Minnesota if they are still in business. Mike
Michael Foerder thanks alot I'm from trinidad and Tobago I did my level 1&2 penetrant testing also did nace level 1 as well as ultrasonic testing but thanks alot gonna do this with asnt
Daryl, If you're interested, this career field as actually best practiced, and most in depth in the Air Force. AF NDI/Nondestructive Inspections is my current AFSC and I whole heartedly recommend it. You will find far, far higher standards of inspection tools, procedures, and far more impressive equipment.
Very interesting I was “attracted” to this “recording” because it’s in my “field” No seriously we only concentrate on surface braking indications on the whole I don’t try and be flash and point out furring because I don’t have to for most procedures
In my opinion, performing MPI with liquid suspension is much easier. This particular way is suitable for hot surfaces. And please, next time put on a respirator.
Why aren't you going in two different directions? Also, 2 inch crack on in the heat affected zone? No sir...that's just holding on the toe of the weld. Try again in the opposite direction...hahaha thanks for the laugh bud
Worst explaination , you could have specify when to switch on DC power supply and AC power supply , you could have mentioned first we have to demagnetise it then switch to dc/ac current and then perform the experiment
