Studies on metallurgical and mechanical properties of laser welded dissimilar grade steels

Saravanan, S.; Raghukandan, K.; Sivagurumanikandan, N.

doi:10.1007/s40430-016-0658-8

Cited by 19 publications

(7 citation statements)

References 23 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the different morphology and austenite arrangement between weld metal and lean duplex, the microhardness of the autogenous weld metal was higher (about 20 HV0.2) than microhardness of the lean duplex steel [ 33 ]. The results are distinctive for dissimilar austenitic—duplex stainless steel welded joints—which was also demonstrated by other authors [ 33 , 52 , 54 ].…”

Section: Resultssupporting

confidence: 84%

“…The results of ferrite content measurements were compared with the results obtained from the Schaeffler diagram-a graphic method for assessing the weldability of high alloy steels and dissimilar joints. Schaeffler diagram is a good preliminary prediction method for weldability of steels subjected to fusion welding [54]. It was assumed, according to the welding conditions presented in Chapter 2, that a dilution rate was 50%, so the values of Creq and Nieq for the weld metal are 21.9% and 8.9% respectively, and this corresponds to about 30% of the amount of ferrite (Figure 11).…”

Section: Ferrite Content Measurements and Calculationsmentioning

confidence: 99%

“…The approximately 50:50 ferrite/austenite microstructural balance can be reached with solution annealing in the range of 1050-1100 • C, and it is especially important in autogenous welds [33]. Saravanan et al stated that the higher microhardness of the weld zone is attributed by the formation of finer and uniform grains following high cooling rate [54].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Autogenous Fiber Laser Welding of 316L Austenitic and 2304 Lean Duplex Stainless Steels

2020

View full text Add to dashboard Cite

This study presents results of experimental tests on quality of dissimilar welded joints between 316L austenitic and 2304 lean duplex stainless steels, welded without ceramic backing. Fiber laser welded butt joints at a thickness of 8 mm were subjected to non-destructive testing (visual and penetrant), destructive testing (static tensile test, bending test, and microhardness measurements) and structure observations (macro- and microscopic examinations, SEM, element distribution characteristics, and ferrite content measurements). Non-destructive tests and metallographic examinations showed that the welded joints meet the acceptance criteria for B level in accordance with EN ISO 13919–1 standard. Also the results of the destructive tests confirmed the high quality of the joints: specimens were fractured in base material with lower strength—316L austenitic stainless steel and a 180° bending angle was obtained confirming the high plasticity of the joints. Microscopic examination, SEM and EDS analysis showed the distribution of alloying elements in joints. The microhardness of the autogenous weld metal was higher by about 20 HV0.2 than that of the lean duplex steel. Ferrite content in the root was about 37% higher than in the face of the weld. The Schaeffler phase diagram was used to predict the phase composition of the welded joints and sufficient compliance with the magnetic method was found. The presented procedure can be used for welding of 316L–2304 stainless steels dissimilar welded joints of 8 mm thickness without ceramic backing.

show abstract

Section: Resultssupporting

confidence: 84%

Section: Ferrite Content Measurements and Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Autogenous Fiber Laser Welding of 316L Austenitic and 2304 Lean Duplex Stainless Steels

2020

View full text Add to dashboard Cite

show abstract

“…They observed that the presence of martensite in the fusion zone of dual phase steels whereas martensite and bainite were found in the fusion zone of HSLA and dissimilar welded joints. Saravanan et al (2017) studied the comparative analysis of dissimilar laser welding of three different steel combinations of ferritic, austenitic and super duplex stainless steels using pulsed Nd:YAG laser. They found that the tensile strength of the welded joints were higher at low welding speed for all the three combinations.…”

Section: Introductionmentioning

confidence: 99%

Effect of average beam power on microstructure and mechanical properties of Nd: YAG laser welding of 304L and st37 steel

Kumar

Sinha

2019

WJE

View full text Add to dashboard Cite

Purpose The present research work aims to study the effect of average beam power (laser process parameters) on the overlapping factor, depth of penetration (DOP), weld bead width, fusion zone and heat affected zone (HAZ) in laser welding of 304L and st37 steel. Back side and top surface morphology of the welded joints have also been studied for varying average beam power. Design/methodology/approach Laser welding of austenitic stainless steel (304L) and carbon steel (st37) was carried out using Nd:YAG laser integrated with ABB IRB 1410 robot in pulse mode. The selection of laser process parameters was based on the specification of available laser welding machine. Dissimilar laser welding of 304L and st37 carbon steel for full depth of penetration have been performed, with varying average beam power (225-510W) and constant welding speed (5mm/s) and pulse width (5ms). Findings Recrystallized coarse grains were observed adjacent to the fusion zone and nucleated grains were seen away from the fusion zone towards carbon steel. Overlapping factor and HAZ width st37 side increases with increase in average beam power whereas top weld bead width increases first, attains maximum value and then subsequently decreases. Bottom weld bead width increases with increase in average beam power. The mechanical properties namely microhardness and tensile strength of the welded joints have been investigated with varying average beam power. Originality/value In the recent development of the automobile, power generation and petrochemical industries the application of dissimilar laser welding of austenitic stainless steel (304L) and carbon steel (st37) are gaining importance. Very limited work have been reported in pulsed Nd:YAG dissimilar laser welding of austenitic stainless steel (304L) and carbon steel (st37) for investigating the effect of laser process parameters on weld bead geometry, microstructural characterization and mechanical properties of the welded joint.

show abstract

“…Of the available methods, pulsed laser welding upholds the above demands and replace the other competing welding methodologies, because of the formation of a narrow weld zone, high depth to width ratio, low distortion, rapid cooling and a more refined grain structure occurring during the process. In addition, Pulsed Nd: YAG laser holds a distinct advantage of achieving higher penetration and lower power consumption [2].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Process Parameters in Nd: Yag Laser Welding of Hastelloy Sheets Through Taguchi Method

Saravanan

2019

Journal of Manufacturing Engineering

View full text Add to dashboard Cite

Optimization of weld width and tensile strength in pulsed Nd: YAG laser welded Hastelloy C-276 sheets, subjected to varied welding speed (350-450 mm/min), pulse energy (10-14 J) and pulse duration (6-8 ms), is attempted. Experimental conditions are designed based on Taguchi L9 orthogonal array. The parameters for attaining a minimum weld width and maximum tensile strength were determined by computing the Signal-to-Noise ratio. Further, a mathematical model is developed for determining the weld width and tensile strength of the weld, based on the regression analysis using statistical software MINITAB-16 and the level of fit are determined by analysis of variance.

show abstract

Studies on metallurgical and mechanical properties of laser welded dissimilar grade steels

Cited by 19 publications

References 23 publications

Autogenous Fiber Laser Welding of 316L Austenitic and 2304 Lean Duplex Stainless Steels

Autogenous Fiber Laser Welding of 316L Austenitic and 2304 Lean Duplex Stainless Steels

Effect of average beam power on microstructure and mechanical properties of Nd: YAG laser welding of 304L and st37 steel

Optimization of Process Parameters in Nd: Yag Laser Welding of Hastelloy Sheets Through Taguchi Method

Contact Info

Product

Resources

About