![]() While choosing an applicable process the fusion cut edges can be converted directly. the cut edges only have small heat affected zones and are generally free of micro cracks and thus are well formable. 1.4401 is very suitable for laser beam fusion cutting with nitrogen or flame cutting with oxygen. A hot crack hazard for the welding seam does not exist, when choosing an applicable process. helum as inert gas, the welding seam is as corrosion resistant as the base metal. With avoiding oxidation within the seam surface during laser beam wedling by applicable backhand welding, eg. With larger welding grooves a similar filler metal can be used. With a welding groove width smaller 0.3mm respectively 0.1mm product thickness the use of filler metals is not neccessary. 1.4401 is very suitable for laser beam welding (weldability A 9in accordance with DVS bulletin 3203, part 3). The tacks should be subsequently grinded or at least be free from crater cracks. Tack welds have to be affixed with relatively shorter distances from each other (significantly shorter than these of non-alloyed steels), in order to prevent strong deformation, shrinking or flaking tack welds. An accumulation of weld seams should be avoided. The included angle should be 60° - 70°, when using MIG-welding about 50° are enough. For product thicknesses over 12mm the double-V butt weld has to be preferred instead of a single-V butt weld. back-step sequence welding, welding alternately on opposite sides with double-V butt weld, assignment of two welders when the components are accordingly large) have to be respected notably. When welding 1.4401 all procedures, which work against this distortion (eg. In connection with a worse thermal conductivity, a greater distortion has to be expected. This steel has an extensively higher coefficient of thermal expansion as non-alloyed steel. Copper back-up plates for faster heat rejection are functional, whereas, to avoid cracks in the solder metal, it is not allowed to surface-fuse the copper back up plate. To avoid overheating or burn-through of thinner sheets, higher welding speed has to be applied. Their fusion point is lower than that of non-alloyed steel therefore austenitic steels have to be welded with lower heat input than non-alloyed steels. Austenitic steels only have 30% of the thermal conductivity of non-alloyed steels. A heat treatment after welding is normally not usual. A preheating is not necessary for this steel. The use of a higher alloyed filler metal can be necessary due to the cast structure of the weld metal. When choosing the filler metal, the corrosion stress has to be regarded, as well. Standard welding processes for this steel grade are: ![]()
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