All kind of industries have their own constraints and different standards. The hygienic regulations are valid for a large number of applications. The food and beverage industry, pharmaceutical and cosmetics, the aeronautic industry and the chemical and petrochemical industries, and of course the fabrication of semi-conductors.
How are hygienic standards defined?
As an example you can consider that the food and pharmaceutical industries will need thin tubes with high quality cuts, as no bacteria is allowed to be present on the weld. On the other hand the aeronautical industry requires welds with a complete shielding gas protection.
Thus the technical requirements are very specific according to each industry and you will have to comply to numerous legal standards. The European Union makes efforts in order to standardise the rules for the welding requirements, but the situation is different if you deal with countries outside of the European Union. Every country has its specific rules when it comes to welding processes and the eventual quality.
The essential point concerning the respect of the quality standards generally concerns the tubes and the way in which the weld is realized. A lot of industries use tubes. The food and pharmaceutical industries convey sensitive or specific fluids that need high quality installations.
how to choose your welding method?
If you have to realize a tubular circuit you will have to assemble straight tubes with tube bends, T-pieces, flanges, valves etc. In most cases this assembly will be done by welding. The welds can be done in different ways according to the application and most of all according to the material that has to be welded: steel, stainless steel, titan, austenitic steels and, of course, the wall thickness.
TIG, the most common welding process for orbital welding
When it comes to welding stainless steels, the most widespread welding process is TIG welding (Tungsten Inert Gas), as it is recommended for high precision welds. These connection points can be most vulnerable for leakages, fine cracks, corrosion, mechanical fragility, for example.
According to the characteristics of the installation (pressure …), the welds must have been dispensed correctly and the welding parameters have a traceability. If the welds have been done manually by a welder, he must have the necessary qualifications. Qualification tests must be repeated every two years for every welder.
Automated orbital welding: the best process to comply with hygienic standards!
When orbital welding machines create a welded joint automatically, it can record the actual welding parameters at any moment, and thus precisely document each welded joint. In this case, welder certifications are also required, but the machine, once correctly calibrated, is able to reproduce very high-quality welded joints.