Investigation on the effect of power and velocity of laser beam welding on the butt weld joint on TRIP steel

Abstract

In this study, the characterization of laser weld joint on transformation-induced plasticity (TRIP) steel sheets coupled with Nd:YAG laser welding was investigated, and the influence of welding conditions like angle of weld, power of laser, and welding speed on the strength of the joint was measured. The microstructure, tensile behavior, and microhardness of TRIP laser-welded sheets were examined in detail. The power was maintained constant, i.e., 1800 W, and by relatively varying the velocity from 25 to 30 mm/s, the strength of the joint increased drastically to 11%. In contrast, by varying the power, the effect of velocity was reduced; however, the point performance was enormously stable. Finally, the microhardness behavior of the heat-affected zone and fusion zone was investigated and discussed.

Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO2 laser welding for automobile manufacturing

“…In this paper, when laser power is from 2000 W to 2200 W, there shows a certain positive correlation trend among laser power, tensile strength and elongation. This correlation had been reported in the research of laser welded joint of high-strength TRIP steel by Rahul [18], and they found that as the laser power increased, the positive correlation between elongation and tensile strength became more obvious. In this case, the highest average tensile strength and average elongation of ASSAPH440/DC25D+ZF45 laser welded joint is 644.3 MPa and 23.9% respectively on the condition of 2000 W laser power, which is calculated by the minimum crosssectional area of the different thickness (2.0 mm+2.6 mm) dissimilar metal welded joint.…”

“…So flow of shielding gas is also one of important parameters to welding quality. On the other hand, the composition of shielding gas has also a certain influence on surface quality of welding seam, penetration formation and mechanical properties of the welding joint [18,19]. The 99.9% purity argon shielding gas and 20 l min −1 shielding gas flow are determined in these welding experiments.…”

“…Sevc [32] has investigated the fiber laser welded TRIP/HLSA sheets with different thicknesses, they found that the highest microhardness is at the HAZ of TRIP steel side, while in this study, the higher microhardness is at the weld center, which also agrees with our research result (show in figure 11). Rahul [18] has investigated on the effect of power and velocity of laser beam welding on tensile strength of the TRIP steel butt weld joint, and Shu [33] has also studied the effect of process parameters on the tensile strength of the laser welded joint of HC550/DP780 high strength steel with different thicknesses. They regard that as the laser power increases, the tensile strength of the welded joint increases firstly and then slightly decreases, which are consistent with our research results (shown in figures 16 and 17).…”

An Investigation on Laser Welding Parameters on the Strength of TRIP Steel

“…The weld was performed on the transverse direction of the length of the specimen, which is prepared as per the ASTM E8/E8M [40] standards with the desired length. The laser welding setup with a schematic diagram along with the chemical compositions and mechanical properties of as-prepared materials can be obtained from our recent publication [41].…”

Characterization of weld seam surface and corrosion behavior of laser-beam-welded AISI 2205 duplex stainless steel in simulated body fluid

“…AISI 2205 stainless steel sheets were joined using parameters given in Table 2 with TRUMPF LASER-CELL 1005 CO 2 laser beam welding machine in flat position and without additional welding wire. CO 2 laser beam welding technique differs from many traditional welding techniques because of low heat input, high focusing energy, high welding speed, narrow welding region, deep penetration, compatibility for automation, high mechanical strength, low distortion, and ability to weld without extra welding wire [4,11,[21][22][23][24][25].…”