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Austenitic stainless steels are the most common choice for high vacuum and ultra-high vacuum systems. Not all alloys are suitable; e.g. the free-machining 303 steel contains sulfur, which tends to outgas. Alloys with good weldability under argon arc welding are usually chosen. 304 stainless steel is a common choice of a stainless steel.
Local vacuum systems allow workpieces to be welded without requiring the workpiece to be enclosed within the work chamber. Instead, a vacuum is established by sealing the chamber to one section of the workpiece, welding that section, and moving the chamber or the workpiece (continuously or in discrete steps) to additional sections and repeating ...
High pumping speed — possibly multiple vacuum pumps in series and/or parallel; Minimized surface area in the chamber; High conductance tubing to pumps — short and fat, without obstruction; Use of low-outgassing materials such as certain stainless steels; Avoid creating pits of trapped gas behind bolts, welding voids, etc.
Covered electrodes for manual arc welding of stainless and other similar high alloy steels - Code of symbols for identification ISO 3834: Quality requirements for fusion welding of metallic materials, five parts. ISO 4063: Welding and allied processes - Nomenclature of processes and reference numbers ISO 5817: Welding.
Cold welding or contact welding is a solid-state welding process in which joining takes place without fusion or heating at the interface of the two parts to be welded. Unlike in fusion welding, no liquid or molten phase is present in the joint. Cold welding was first recognized as a general materials phenomenon in the 1940s.
Most weld purging is carried out on joints made by the TIG or GTAW arc welding process. [6] When the laser welding process is chosen, joints or welds being made on reactive materials will need to be carried out and in the case of electron beam welding, this is carried out in a vacuum, in which case purging takes place by complete evacuation of all gas.
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