Re: Cracked Receiver
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cal50</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: C. Dixon</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Force_Multiplier</div><div class="ubbcode-body">is that even metal... kinda looks like epoxy </div></div>
On that note:
If it were me:
I'd sand blast the snot out of it and take to an automotive machine shop that has a magnaflux (wet mag) setup.
They'll stain it and hit it with a UV light. Any cracks will glow and become instantly self evident.
Good luck.
C. </div></div>
Or hillbilly magnaflux~
Spray with carb cleaner and let excess evaporate, hit with heat or heat gun. Any cracks you will see a wet spot where the cleaner is trying to escape.
(The receiver is scrap metal from appearance) </div></div>
You guys are talking about two separate methods of NDT here. The "Stain it" one is Penetrant. You spray it with penetrant, let it dwell so capilary action can draw it into the indication (pin hole, crack, etc), clean the excess off and then spray it with developer that will then draw the penetrant off. Or go without the developer and just examine it with the blacklight looking for the bleed out of PT.
"Magnaflux" is actually a brand name. They were the first company to commercially develop the Magnetic Particle method of nondestructive examination. Which is known as MT in the inspection industry, but the firearms buzz-word is "MPI" which makes me laugh every time I read it.
The MT method uses magnetism and iron particles (thus Magnetic Particle) to detect indications due to the magnetic flux leakage created at the indication. I could write a shitload more, but that should help a little bit with terminology if it ever comes to you actually needing to talk to an NDT Lab when requesting inspection.
And FWIW, don't simply trust any machine shop with an MT or PT setup just because they have a blacklight. If you are going to use them, at least ask them if they have any sort of certifications from ASNT, which they should if they are performing this kind of work.