I GOT AN 8INCH STAINLESS STEEL PLATE IN MY CHEST AND WHEN I GET AN RAY DAM IT HURTS Stainless steel shot is utilized in shotgun shells that are intended for waterfowl hunting. Then there's the 'fléchette round', comprised of flat stainless steel needles, that are renowned for their ability to penetrate dense targets.
During this procedure the patient is placed between the x-ray beam and an x-ray plate. The x-ray beams reflect through the patient body to the x-ray plate.
As opposed to visible light, where what we see usually is made up of light that bounces back to us from the object that were' looking at, x-ray pictures are made up of radiation that has gone through the object we're examining. A single piece of plastic surrounded by air would probably be detected, while a piece of plastic sitting on a steel sheet would probably not be detected.
It can not pass through any metal or hard object. There used to be glasses that were marketed as giving Blu-ray vision but they never truly worked. Not naturally, no.
X-rays used in human medical imaging and in airport scanners are lower powered machines, but they too will penetrate thin foils. An x-ray machine works the following way: 1) An emitter that emits an x-ray burst.
2) X-rays pass through less dense objects (skin, muscle) and is blocked by more dense objects (bone, tumors). 4) X-rays darken the film where it is struck, and areas that were unable to pass through appear bright(bones, etc).
Doctors and people who want to look through things airports uses x-ray machines to inspect luggage Metal appears as a bright area on an X-ray, blocking visibility of underlying structures.
The reason you're asked to remove metal is to give the radiologist an unobstructed view of the area of interest. The reason metal appears bright on the X-ray image is that it is extremely dense, so X-radiation does not penetrate it as well as it does soft tissues.
Forum AWS Website Help Search Login My company has a job coming up that is going to be SS pipe that has to be X-ray tested.
Is the procedure to weld the pipe the same as carbon pipe i.e. open root pass followed by hot pass, fillers and cap? Stainless steel pipes are welded by TIG (correct name GTA) and also, even if less frequently, by GMAC.
Bevels in carbon steel pipes are usually done by means of a beveling torch that employs an oxyacetylene flame or a beveling machine that use either a silicon carbide (commercial name Carborundum) stone or a high speed steel or tungsten carbide (commercial name Lidia) cutting tool. Oxyacetylene flame does not cut stainless steel, a plasma torch must be used instead.
Carborundum, high speed steel and Lidia are high carbon materials that will leave a carbon residue in the cut surface, making it prone to intergranular corrosion. Not to be rude if you don't know THS answers to the questions you asked you had no business even attempting the job.
A pumping skid will be built in the shop, and then I go into the field using a TIG setup off of a stick welder. The shops I have worked in usually cut it with a handsaw and then bevel it with a Bristol or equivalent (most I've seen are pneumatic), and you'll want a good sharp bevel with no land.
Plasma cutting is an option, just depends on what you like (this option takes a lot of grinding afterward to get a good clean weld surface). Go with a 1/8” gap, a good argon purge, and GTA with 1/8” 308 wire.
It's just about as fast to just use GTA Wall the way out, I've also seen shops go to FLAW after the root, SAW is definitely the last choice you want to go with when welding stainless, I've yet to find an s.s. stick rod that welded worth a sh’t! Amperage is about the same as carbon steel welding, the biggest trick is to not let the pipe get too hot.
Then wrap the joint in masking tape, leave a 1/4” gap at the top to purge the air out. Purging times all depend on size and length of piping.
Once I feel the joint is ready to weld I will set the flow rate of the purge line down closer to 8-12 CFH. A quick flick of the torch will burn the tape back enough to continue welding.
Watch the purge pressure as you close up the weld you might have to turn it down little by little. (I just cut a piece of foam or drag whatever is available and tape to the end) 1/8 gap 3/32 filler no landing.
Works wonderful, perfect bevels every time, ready to weld. Your cuts with the handsaw can even be a little out of square and this tool will face it up for you every time.
So, 56 years ago, started a story in Electronics Weekly’s edition of December 21st 1960 The eight million electron volt linear accelerators is now being built by the High Voltage Engineering Corp of Burlington, Mass.
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