Duplex Stainless Steel Lab Report

Mohammed Asif M et al studied the impact of heat input on tensile strength, toughness, micro hardness, micro structure and corrosion behavior of duplex stainless steel joints. Four parameters were varied by keeping speed as constant. The heating pressure of 30, 40, 50 MPa, heating time of 3, 4, 5 sec, upset pressure of 60, 70, 80 MPa, upset time of 2, 3, 4 sec were used to weld the joints. L9 orthogonal design concept was used. Results revealed that no intermetallic phases were formed. By increasing the heat input the tensile strength of the joint was increased and at the same time the impact strength of the joints was decreased. Impact of heat input shows revers behavior on tensile and impact strength of the welded joints. The hardness of
The base material for his study is UNS S32760 super austenitic stainless steel of 16 mm diameter and 100 mm length. The design of experiments concepts like central composite design was used to estimate the behavior of welded joints. A four-factor, three- level Central Composite design was used. The parameters are varied such that a speed of 1000. 1500, 2000 rpm, burn off length of 2, 4, 6 mm, friction pressure of 40, 80, 120 MPa, upset pressure of 122, 146, 170 mm. From the micrograph of welded joint it was understood that flashes are formed around on both sides of the welded joint. Good weld joint was obtained. Tensile strength of the joint was higher than the base material and fracture of the joint was away from the joint. Toughness and weld hardness of the weld joint was higher than the base
the rubbing speed is varied from 042 to 3.36 m/s, and axial force of 2.4 to 19 Kn for carry out experiments. The results obtained indicate that rubbing speed play an important role than the axial force in determining the frictional behavior of the joint.
M ES Abdel Moneim et al successfully welded pure aluminum tubes of thicknesses of 4.5 and 6 mm and outside diameter of 40 mm. the special guide has designed to accommodate the tubular specimens. The depths of the stressed layers in all the tests ranged from 1250 to 1450 pm and this corresponds to a proportion of between 0.2 and 0.35 of the tube thickness. The chamfer angles were chosen are 150, 300 450 and 600 and speed of 1600 rpm. Results reveal that the level of chamfering has no effect on the development of residual stresses. The amount of residual stresses increases with the increase in wall