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Chemical Composition

Chemical Composition

Chemical Composition

(OP)
I need to buy an instrument to analize the quimical compotition of steels before welding.

The instrument is like a portable gun that makes an arc with the piece to be analize

Does anyone knows this instrument and how it is called?

Thanks

RE: Chemical Composition

It's called PMI; psoitive material identification.
There pretty expensive devices (in the EU they can easily cost 35k euro's), and are not 100% accurate/reliable, but I believe theyre accurate enough to determine if a Chinese stainless steel pipe really complies with the certificate ... ;)

Ive seen them in action once and it's pretty impressive.

RE: Chemical Composition

Also known by the acronym XRF (X-Ray Fluorescence).  Niton is one brand.

RE: Chemical Composition

One major problem. They can't determine carbon content, which is a major issue if you are working with steel.  

Best regards - Al  

RE: Chemical Composition

ARC-MET8000 from Dynatech will also "do" carbon content.  It will leave a small plasma mark at the spot tested.  Carbon content requires a tiny sample to be evaporated.

The Niton 'guns' use X-Ray Fluorescence, and leave no marks.  But no carbon analysis.

RE: Chemical Composition

Good to know.
 

Best regards - Al  

RE: Chemical Composition

There are also slightly bigger, but more accurate device (size in the range of a compact GTAW device). They're more accurate than PMI, and I believe they also do carbon content,

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