Sheet Metal Fortified Joints Formation and Assessing Mechanical Properties

Geometrical precision is one of the most significant quality factors in sheet metal gathering, for example, a car body. The sheet metal fabricators have since quite a while ago assuaged on downpour busters and ultra-adaptability counteracts spills in unforgiving condition. The two essential joints incorporate the entire area of joints utilized in sheet metal congregations for auxiliary expansion. This paper shows the examination conduct of 10 check sheet metal fortified joints with mechanical properties like hardness test and Erichsen test. This outcomes gives improved comprehension of sheet metal get together forms and gives another plan to supportive item and procedure structure.

Effect of heat input on microstructure and properties of dissimilar laser welded joints between TWIP and TRIP steels

In this present, the experimental steels were produced by different rolling and heat treatment processes. After that, dissimilar laser tailor welding was carried out with different heat inputs (40, 60 and 100 J/mm2) using IPG YLR 6000 fiber laser with Ar gas shielding. Hitachi SU5000 scanning electron microscope (SEM) and Zeiss Axio Vert.Al optical microscope were used to observe the microstructure of the welded joints after being polished and etched with 4% nital. HV-1000 microhardness tester was used to measure the microhardness of welded joints. Tensile test was carried out using DNS-100 universal material testing equipment, and Erichsen test was conducted using CTM604 Erichsen test machine. Five groups of repeated experiments were selected for the performance test. Tensile fracture surface morphology of welded joint was observed by SEM. The effect of heat input on microstructure and properties of dissimilar welded joints between high manganese TWIP steels and low manganese TRIP steels was studied. The results showed that weld width and penetration were increased and complete penetration was obtained when the heat input increased to 60 J/mm2. With heat input increased, the microstructure of welded seam was more inhomogeneous. The distribution of Mn content in welded seam was inhomogeneous such that columnar/equiaxed austenite was formed in rich Mn zone and lath martensite was formed in barren Mn zone. Heat input had no influence on the microstructure and hardness on the HAZ. The mechanical properties of welded joints of 60 J/mm2 were superior and its strength-ductility balance was greater than TRIP BM (23 GPa%) and was 82% of TWIP BM (36 GPa%). The formability of 60 and 100 J/mm2 was similar.

Casting of an Mg Alloy Clad Strip Using a Twin Roll Caster Equipped with a Scraper

Casting of an Mg alloy clad strip was attempted with a twin roll caster equipped with a scraper in an oxidizing atmosphere. The base strip was AM60 and the overlay strip was AZ121. The AM60 strip was cast with a roll, and the upper side of the strip was scribed by the scraper. The molten AZ121 was poured on the scribed AM60 strip. The scribed surface of AM60 contacted the molten metal of AZ121 without exposure to the atmosphere. Therefore, the scribed surface was not oxidized. Most of the AZ121 strip was solidified by the other roll. The casting speed was 30 m/min. The roll load was 0.05 kN/mm. The roll speed was very high and the roll load was very small. However, the strips were bonded, and they did not peel with bending until breaking. The interface between the two strips was clear. When AM60 was on the outer side, the results of the V-bending test and the Erichsen test were better. These results mean that the ductility of AZ121 was improved by cladding with AM60.