Effect of energy transfer modes on solidification cracking in pulsed laser welding

Chelladurai, A. M.; Gopal, K.A.; Murugan, S.; Albert, Shaju K.; Venugopal, S.; Jayakumar, T.

doi:10.1179/1362171815y.0000000041

Cited by 12 publications

(2 citation statements)

References 17 publications

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“…In fusion welded joints, a small amount of fine δ ferrite is usually desired so as to prevent formation of hot crack. 20, 21 However, the δ ferrite in FTP WZ is slender and distributes continuously along the coarse austenite boundaries. This kind of distribution characteristic causes microcracks to easily emerge at and may propagate along the γ–δ phase boundaries to form macrocracks when the WZ is subjected to severe plastic deformation during welding process.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and mechanical properties of underwater friction taper plug weld on X65 steel with carbon and stainless steel plugs

Yin

Yang

Cui

et al. 2016

Science and Technology of Welding and Joining

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Underwater friction taper plug welding for X65 pipeline steel was performed using Q345 structural steel and 316L stainless steel plugs. Weld microstructures, defects formation and mechanical properties were investigated. Using Q345 plugs can produce defect free and overmatching welded joints whose impact toughness was also favourable. Lower bainite and lath martensite in the weld zone resulted in high hardness with maximum value up to 418 HV10. Using 316L plugs can significantly reduce weld zone hardness due to austenite dominated microstructure. Microcracks can easily emerge at and may propagate along c-d phase boundaries to form macrocracks. Intermittent cracks were found along the bonding interface of all the 316L plug welds, which should be caused by the relief of the residual stress.

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Section: Resultsmentioning

confidence: 99%

Microstructure and mechanical properties of underwater friction taper plug weld on X65 steel with carbon and stainless steel plugs

Yin

Yang

Cui

et al. 2016

Science and Technology of Welding and Joining

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show abstract

“…Alvarez et al [9] compared the hot cracking sensitivity of tungsten inert gas welding (TIG) and laser beam welding (LBW) by analyzing the microstructure and chemical composition of the welding seam of 718 alloy. Chelladurai et al [10] studied the solidification cracking behavior of 316 stainless steel under different energy transfer modes by adjusting the pulse parameters in pulsed laser welding (PLW). Hosseini et al [11] investigated the effect of heat input and welding speed in electron beam welding (EBW) on the hot cracking sensitivity of AA2024-T351 alloy experimentally.…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic Fracture Analysis of the P91 Steel Welded Joint under Repair Welding Thermal Shock Based on XFEM

Yang

Zhang

Zhao

2020

Metals

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P91 steel is a typical steel used in the manufacture of boilers in ultra-supercritical power plants and heat exchangers in nuclear power plants. For the long-term serviced P91 steel pressurized structures, the main failure mode is the welded joint failure, especially the heat affected zone (HAZ) failure. Repair welding technique is an effective method for repairing such local defects. However, the thermal shock composed of high temperature and thermal stress in the repair welding process will pose a critical loading condition for the existing defects near the heat source which cannot be detected by conventional means. So, the evaluation of structural integrity for the welded joint in the thermal-mechanical coupling field is necessary. In this work, the crack propagation law in the HAZ for the P91 steel welded joint was investigated under repair welding thermal loads. The weld repair model of the P91 steel welded joint was established by ABAQUS. The transient temperature field and stress field in repair welding process were calculated by relevant user subroutines and sequential coupling simulation method. The residual stress was determined by the impact indentation strain method to verify the feasibility of the finite element (FE) model and simulation method. In order to obtain the crack propagation path, the elastoplastic fracture analysis of the welded joint with initial crack was performed based on the extended finite element method (XFEM). The influence of different welding linear energy on the crack propagation was analyzed. The results show that the cracks in the HAZ propagate perpendicular to the surface and tend to deflect to the welding seam under repair welding thermal loads. The crack propagation occurs in the early stage of cooling. Higher welding linear energy leads to larger HAZ and higher overall temperature. With the increase of welding linear energy, the length and critical distance of the crack propagation increase. Therefore, low welding linear energy can effectively inhibit the crack propagation in the HAZ. The above calculation and analysis provide a reference for the thermal shock damage analysis of repair welding process, which is of great significance to improving the safety and reliability of weld repaired components.

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Characterization and formation mechanism of periodic solidification defects in deep-penetration laser welding of NiCrMoV steel with heavy section

Sun

Cui

Tang

et al. 2018

Int J Adv Manuf Technol

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Effect of energy transfer modes on solidification cracking in pulsed laser welding

Cited by 12 publications

References 17 publications

Microstructure and mechanical properties of underwater friction taper plug weld on X65 steel with carbon and stainless steel plugs

Microstructure and mechanical properties of underwater friction taper plug weld on X65 steel with carbon and stainless steel plugs

Elastoplastic Fracture Analysis of the P91 Steel Welded Joint under Repair Welding Thermal Shock Based on XFEM

Characterization and formation mechanism of periodic solidification defects in deep-penetration laser welding of NiCrMoV steel with heavy section

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