CMT weld brazing process (Cold Metal Transfer) knows a higher applicability in various industries (aeronautic, automobile) due its advantages compared with other welding processes. The paper presents the experimental results obtained on sheets joints using austenitic stainless steel mark 304 of 1 mm thick in butt and overlap variants using CuSi3 filler alloy of 1.2 mm diameter. The macroscopic analysis shows that were not presented welding defects and the microscopic examination did not showed welding defects such as microcracks. After the mechanical tests it was observed that al the tested specimens the fracture occurred in the base metal except the sample 1 where the fracture occurred in the welding zones. The bending test showed that all the samples were bent to 180° without cracks which assure good mechanical resistance to deformation. ΔHV1 estimator values determined in the characteristic areas of the joints shows that at sample 2 there are structural hardening tendencies in the zones BM1-WELD and BM2-WELD with values of 36% respectively 28.5% attesting moderate structural hardening (ΔHV1<50%), the brittle-type fracture risk in these areas is considered low.
This study presents a comparative assessment of composite materials performance, based on 80%Al+20%CrC, 82%CuNiAl+18%WC and 82%CuZn48+18%CrC, butt welded and corner welded. This comparative assessment resulted in information regarding the chemical content of the welded joints in percent, macro-microstructure estimation of specific areas of the welded edge joints, and determination of HV5 hardness of specific areas of the welded joints, both for butt welding and corner welding. It was shown that there is a slight variation of chemical composition both for butt welding and corner welding. Also all nanostructured composite materials, butt welded and corner welded, examined for macroscopic and microscopic examinations showed no welding defects. After testing the HV5 hardness of specific areas of butt and corner welded joints, made using WIG and CMT welding processes, the estimator value for structural hardening ΔHV5 between specific areas (WELD, HAZ, BM) was determined.
In many countries, in the industrial practice, the hard layers deposition is used to increase the hardness of the components active zones. A viable solution to increase the imposed properties consists in the deposition of amorphous layers by thermal spraying. Ferroalloy powders were deposited by plasma jet thermal spraying on aluminium substrates in order to increase the hardness. By plasma jet thermal spraying of Fe-B, Fe-Ni-B and Fe-Cr-Mn-Mo-W-B-P-Si powders on aluminum supports, have been obtained hard layers having the thickness between 72 μm and 86 μm, and granular structures made from α solid solutions, fine particles of specific oxides and complex particles of Fe-B, Fe-B-Si, Fe-Cr, Fe-W-Mo and Fe-P. The measured hardness had the values between 383 and 391 HV1 for the deposited layers made from powders type Fe-B, the values between 410 and 420 HV1 for the deposited layers made from powders type Fe-Ni-B, and the values between 448 and 475 HV1 for the deposited layers made from powders type Fe-Cr-Mn-Mo-W-B-P-Si. No defects, such as cracks or microcracks, have been observed on the hard layers surfaces deposited by plasma jet thermal spraying.
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