Duplex Stainless Steel for Bridges Construction: Comparison between SAW and Laser-GMA Hybrid Welding

The effect of laser beam wobbling mode in welding process for structural steels

“…The results of microhardness measurement show that, in most cases, level values of the root side are higher than those of the middle and cap side, which is usual for laser welding (Table 3) [2,5]. The second welding pass with wobbling mode has more heat input due to lower speed and bigger welding pool, respectively, lower volume of microhardness.…”

“…In the last few years, lot of papers about laser welding with special technical applications, like hybrid laser arc welding [1][2][3][4][5][6], twin spot laser welding, laser welding with cold filler material [6], friction stir welding with laser tempering, hybrid welding with different combination arc leading, laser leading etc., were published. In addition, hybrid laser welding is used for dissimilar materials, like Fe-Al joint [7], bifocal laser beam welding "turbo-weld" for specimen with different thicknesses [8].…”

Welding of stainless steel using defocused laser beam

“…Requirements to reduce weight and increase performance of constructions cause use of more expensive steels of the above grades [3,4]. Corrosion-resistant austenitic steels are extensively used in manufacture of welded components and structures for various purposes [5]. Most common arc welding is mainly used, which has a number of disadvantages for these steels: high coefficient of heat input, low speed, and large heat-affected zone [5,6].…”

“…Corrosion-resistant austenitic steels are extensively used in manufacture of welded components and structures for various purposes [5]. Most common arc welding is mainly used, which has a number of disadvantages for these steels: high coefficient of heat input, low speed, and large heat-affected zone [5,6]. All these factors lead to high level of residual stress, thermal deformations, use of thermal and mechanical treatment after welding, and reduction of corrosion resistance of the weld metal [1,[7][8][9].…”

Heat treatment of welded joints of steel 0.3С–1Cr–1Si produced by high-power fiber lasers

“…This steel is a widely used construction material, which is well-quenched and has limited weldability [16,17]. The basic defects in electric arc welding of these steels are hot and cold cracks, they are formed as a result of polymorphic and phase transformations (Austenite-Martensite, Austenite-FerriteþCementite, AusteniteBainite) [1][2][3][4][5][6][7][8][16][17][18][19][20][21] due to the change of volume, at high speeds of cooling after the thermal influence of welding. To reduce the cooling rate of the welded joint, pre-heating and related heating [22], postweld heat treatment [23][24][25][26][27][28][29] are used, besides it is necessary to prevent cooling of the welded joint to the room temperature.…”