Temperature distribution and residual stresses due to multipass welding in type 304 stainless steel and low carbon steel weld pads

Murugan, S.; Sanjai, K.; Kumar, Pawan; Jayakumar, T.; Raj, Baldev; Bose, Manaswita

doi:10.1016/s0308-0161(01)00047-3

Cited by 117 publications

(60 citation statements)

References 4 publications

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“…The figures show that at the top and root of the weld, longitudinal residual stress reduces by 20-30 % and 30-40 % with the use of GMAW and P-GMAW processes respectively in comparison to that observed in case of using the SMAW process. The transverse residual stress has also been found to follow a similar trend but having a magnitude comparatively lower than the longitudinal residual stress of the weld joint as it is also commonly observed [18][19][20][21] in earlier works. In comparison to SMAW the GMAW and especially the P-GMAW process has been found advantageous with respect to reduction in residual stresses in ASS pipe joint primarily due to its relatively less severity of thermal effect ( Table 3).…”

Section: Shrinkage and Residual Stressessupporting

confidence: 75%

“…The presence of dual peak of residual stresses distributed in either side of weld centre line in weld joint of austenitic stainless steel arising out of interactions of shrinkage and quenching stresses has also been reported by earlier workers. [18][19][20][21] However, almost in all the cases the residual stresses at the weld centre are found relatively higher at the root than top of the weld. Table 4.…”

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confidence: 88%

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Improvement of Weld Characteristics by Variation in Welding Processes and Parameters in Joining of Thick Wall 304LN Stainless Steel Pipe

2008

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Various properties of weld joints of 25 mm thick wall 325 mm O.D, 304LN austenitic stainless steel pipe prepared by using different welding process and conventional V-groove as per AWS specification have been compared. The welding was carried out by commonly used shielded metal arc welding (SMAW), gas metal arc welding (GMAW) and pulsed current gas metal arc welding (P-GMAW) processes. In P-GMAW process the influence of pulse parameters have been studied by considering their summarized influence defined by a dimensionless hypothetical factor fϭ[(I b /I p )f · t b ] where, t b ϭ[(1/f )Ϫt p ]. The characteristics of weld joints with respect to their metallurgical, mechanical, corrosion and fracture mechanics properties as well as residual stresses have been studied and compared. Welding of thick wall stainless steel pipe by P-GMAW process significantly improves the tensile properties, reduces the inclusion and porosity content, increases initiation fracture toughness and lowers residual stresses of weld joint in comparison to those observed of SMA and GMA weld joints. The influence of f on properties of P-GMA weld joints is primarily attributed to the reduction in severity of weld thermal cycle and refinement of microstructure of weld deposit.KEY WORDS: austenitic stainless steel; SMAW; GMAW; P-GMAW; pulse parameters; residual stresses; inter granular corrosion; microstructure; mechanical properties; fracture toughness. stainless steel requiring multipass weld deposition.In view of the above an effort has been made in the present investigation to carry out a comparative study on the characteristics of conventional V-groove welds of 304LN SS pipe prepared by using shielded metal arc (SMA), GMAW and P-GMAW processes. The P-GMA weld joints have been further compared by considering the influence of pulse parameters in reference to variation in f. The characteristics of weld joint have been analysed primarily with respect to the distribution of longitudinal and transverse residual stresses at the top and root of the weld joints and the microstructure of the weld and HAZ. In order to understand their utility the weld joints are also briefly characterised by studying their mechanical, fracture mechanics and corrosion properties. Experimentation Welding of PipesThe welding of 25 mm thick wall and 325 mm outer diameter AISI 304LN stainless steel pipe has been carried out using GTAW autogenously and in consecutive two root passes followed by filling passes using SMA, GMA and P-GMA welding processes at conventional V-groove confirming the ASME Section IX of Boiler and Pressure Vessel Code. Schematic diagram of the weld groove as well as the consumable root insert used of matching composition with filler metal have been shown in Figs. 1(a) and 1(b) respectively. The multipass welding was performed by using appropriately designed welding procedure specifications (WPS) resulting in a practically sound weld with respect to lack of fusion. The welding was carried out in 1GR position by holding the pipes in a rotating table with t...

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Section: Shrinkage and Residual Stressessupporting

confidence: 75%

mentioning

confidence: 88%

Improvement of Weld Characteristics by Variation in Welding Processes and Parameters in Joining of Thick Wall 304LN Stainless Steel Pipe

2008

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“…12, the behavior of the curve resulting from this research conforms with the results of other residual stress measurements in low carbon steel weld pads on the root side of welding specimen after different weld passes as reported by Murugan et.al. [17]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Non-destructive Residual Stress Analysis Around The Weld-Joint of Fuel Cladding Materials of ZrNbMoGe Alloys

et al. 2013

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The residual stress measurements around weld-joint of ZrNbMoGe alloy have been carried out by using X-ray diffraction technique in PTBIN-BATAN. The research was performed to investigate the structure of a cladding material with high temperature corrosion resistance and good weldability. The equivalent composition of the specimens (in %wt.) was 97.5%Zr1%Nb1%Mo½%Ge. Welding was carried out by using TIG (tungsten inert gas) technique that completed butt-joint with a current 20 amperes. Three region tests were taken in specimen while diffraction scanning, While diffraction scanning, tests were performed on three regions, i.e., the weldcore, the heat-affected zone (HAZ) and the base metal. The reference region was determined at the base metal to be compared with other regions of the specimen, in obtaining refinement structure parameters. Base metal, HAZ and weldcore were diffracted by X-ray, and lattice strain changes were calculated by using Rietveld analysis program. The results show that while the quantity of minor phases tend to increase in the direction from the base metal to the HAZ and to the weldcore, the quantity of the ZrGe phase in the HAZ is less than the quantity of the ZrMo2 phase due to tGe element evaporation. The residual stress behavior in the material shows that minor phases, i.e., Zr 3 Ge and ZrMo 2 , are more dominant than the Zr matrix. The Zr 3 Ge and ZrMo 2 experienced sharp straining, while the Zr phase was weak-lined from HAZ to weldcore. The hydrostatic residual stress (σ) in around weld-joint of ZrNbMoGe alloy is compressive stress which has minimum value at about -2.73 GPa in weldcore region.

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“…Wojnowski et al [42] examined the welding heat cycles and microhardness in addition to conducting metallographic analysis of the tempered area in repeatedly welded steel samples. Murugan et al [43] measured the heat cycles related to each welding pass.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Temperature Field during Multi-Pass GMAW Surfacing or Rebuilding of Steel Elements Taking into Account the Heat of the Deposit Metal

Winczek

2016

Applied Sciences

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This paper proposed an analytical model for describing the temperature field of multi-pass arc weld surfacing. The temperature field is described analytically assuming a bimodal volumetric model of the heat source and a semi-infinite body model of the (rebuilt) workpiece. The suggested analytical solution takes into account the temperature changes caused not only by the direct heat of an electric arc, but also by the heat of the applied weld (melted metal of electrode). The solution considers temperature increments caused by overlaying consecutive welding sequences and by self-cooling of areas previously heated. Computations of the temperature field are carried out during the multi-pass gas metal arc welding (GMAW) surfacing of a steel plate. The results are presented in the form of transient and maximum (achieved in whole welding process) temperature distributions in the element's cross-section, as well as thermal cycles at the selected point.

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Temperature distribution and residual stresses due to multipass welding in type 304 stainless steel and low carbon steel weld pads

Cited by 117 publications

References 4 publications

Improvement of Weld Characteristics by Variation in Welding Processes and Parameters in Joining of Thick Wall 304LN Stainless Steel Pipe

Improvement of Weld Characteristics by Variation in Welding Processes and Parameters in Joining of Thick Wall 304LN Stainless Steel Pipe

Non-destructive Residual Stress Analysis Around The Weld-Joint of Fuel Cladding Materials of ZrNbMoGe Alloys

Modeling of Temperature Field during Multi-Pass GMAW Surfacing or Rebuilding of Steel Elements Taking into Account the Heat of the Deposit Metal

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