E308L-16 is created for 304L welding. The electrode is depositing the maximum of carbon 0.04% into the weld metal. E308L-16 type is used extensively for welding of the chemical plant equipment and is successfully used for the welding-type 347 and 321 steel grade. Also, it is minimizing the chromium carbide formation into the weld metal.
There are several testing that is to be necessarily performed to check the production quality. These are like positive material identification test, hardness test, pitting resistance test, intergranular corrosion test, chemical test, mechanical test, bend test, impact test, hydrostatic test, radiography test, macro test, micro test etc.
Yes, to assure the valuable buyers that supplied product is 100% pure and no unwanted metals are used for the production of it. So they are providing documentation as a proof like commercial invoice, heat treatment chart, quality assurance plan, raw material test report, material traceability report etc.