The effect of welded joint properties on the surface characteristics of laser-welded 2205 duplex stainless steel

Abstract

Welded joints of poor welding surface quality are sensitive to stress concentrations, affecting both the tensile strength of workpieces and the fluidity of liquids and gases in pressure and liquid containers. Orthogonal experiments involving the laser welding of 1-mm-thick duplex stainless steel sheets were conducted using different electric current, pulse width and frequency values in order to analyse the effect of welding properties on the surface characteristics of the welded joints. Rapid judgement regarding the welded joint properties was made based on the observed welding surface quality. The results show that an even phase proportion and grain refinement are not necessarily guaranteed to provide good welding surface quality. A satisfactory welding surface quality characterised by a smaller spot pitch or spot pitch difference, smaller weld width, reduced surface roughness and valley depth of surface waviness implies better welded joint mechanical characteristics and a more even microstructure. The specimen with the most suitable welding parameters and the greatest heat input can reach the lowest volume fraction of ferrite phase of 42.5% and the highest tensile strength of 848 MPa, and its surface quality is the best.

Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

“…Laser welding combines the ability to control the shape of the weld, repeatability of the process and easy automation along with an extremely narrow heat affected zone. All these advantages cause more and more interest in using this method to join duplex stainless steels [5,6,7]. Despite the lack of laser welding recommendations for duplex stainless steels, many research teams are trying to adjust laser welding parameters for use in these applications.…”

The Performance of CR180IF and DP600 Laser Welded Steel Sheets under Different Strain Rates

“…Laser welding surpasses traditional welding techniques with speed, thin welding, strength, easy integration, contactless process, and minimal maintenance costs. Due to the small heat input, the welded joint is significantly less prone to deformation due to material expansion [ 19 ]. The disadvantages of laser welding are low-energy efficiency, strict requirements for the purity of working gases (CO 2 , nitrogen, and helium), and material thicknesses up to about 2 mm for solid-state and diode lasers [ 20 ].…”

Effect of Quenching Media on Laser butt Welded Joint on Transformed -Induced Plasticity (TRIP) Steel

“…One of the major advantages of Laser welding is that, without use of filler materials, can produce a joint.The responsiveness of different materials is also affecte d by broad variations in thermal properties and low metal co mpatibility [11][12][13][14][15]. Laser welding has a distinct advantage like Capability to regulate welding, repeatability and quick autom atic profiling which will control the weld profile with an extremely narrow heat affected area [16][17][18]. Very few researchers has done a work in the field of Heat treatment and its characterization [19][20] on laser welding joint in low carbon high strength steel like TRIP steel.…”