Effects of the heat input in the mechanical integrity of the welding joints welded by GMAW and LBW process in Transformation Induced Plasticity steel (TRIP) used in the automotive industry

Cortez, Víctor Hugo López; Medina, G.Y. Pérez; Valdéz, Felipe A. Reyes; López, H. F.

doi:10.1590/s0104-92242010000300010

Cited by 9 publications

(5 citation statements)

References 1 publication

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“…Zhang et al [28] used GMAW to weld a TRIP600 (ferrite, retained austenite and bainite BM) and showed that the weld exhibited excellent mechanical and impact properties due to the microstructural make-up of the fine grained HAZ, which consisted of ferrite and granular bainite. Lopez Cortez et al [29] also found that the HAZ of a GMAW welded TRIP800 automotive steel consisted of a mixed ferrite (polygonal) and bainite (lower), while the fusion zone consisted of martensite and some ferrite (Widmanstatten and allotriophic) and bainite (upper). Grachar et al [30] laser welded an automotive TRIP (ferrite with bainite-austenite BM) and revealed that the microstructure within the inter-critical HAZ (ICHAZ) consisted of ferrite and areas consisting of lath bainite-martensite-austenite.…”

Section: Welding Of Trip Steelsmentioning

confidence: 93%

Induction Weld Seam Characterization of Continuously Roll Formed TRIP690 Tubes

Bardelcik

Ananthapillai

2020

Metals

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The weld seam characteristics of continuously roll formed and induction seam welded TRIP690 tubes were examined in this work. These tube are subsequently used in automotive hydroforming applications, where the weld seam characteristics are critical. The induction seam welds are created through a solid-state welding process and it was shown that by increasing the induction frequency by 26%, the weld seam width within the heat affected zone (HAZ) reduced due to a plateau in the hardness distribution which was a result of a delay in the transformation of martensite. 2D hardness distribution contours were also created to show that some of the weld conditions examined in this work resulted in a strong asymmetric hardness distribution throughout the weld, which may be undesirable from a performance perspective. An increase in the pressure roll force was also examined and revealed that a wider total weld seam width was produced likely due to an increase in temperature which resulted in more austenitization of the sheet edge prior to welding. The ring hoop tension test (RHTT) was applied to the tube sections created in this work. A Tensile and Notch style ring specimen were tested and revealed excellent performance for these welds due to high peak loads (~17.2 kN) for the Notch specimens (force deformation within weld) and lower peak loads (~15.2 kN) for the Tensile specimens for which fracture occurred in the base metal.

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Section: Welding Of Trip Steelsmentioning

confidence: 93%

Induction Weld Seam Characterization of Continuously Roll Formed TRIP690 Tubes

Bardelcik

Ananthapillai

2020

Metals

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“…Mujica et al [2,3] and López Cortéz et al [4] reported martensite formation in FZ and HAZ of Transformation Plasticity (TRIP) steels after laser welding. The hardness typically attains 500 HV in these cases, thus rendering the weldment very brittle for post-processing.…”

Section: Formability Of In-situ Austempered Transformation-induced Plasticity Steels After Laser Beam Weldingmentioning

confidence: 99%

Formability of in-situ Austempered Transformation-induced Plasticity Steels After Laser Beam Welding

et al. 2018

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Laser welded Transformation-induced plasticity (TRIP) steels are known to generate martensite in the fusion (FZ) and the heat-affected (HAZ) zones. To solve this issue, the present study proposes a high temperature (HT) welding to avoid decay below the martensite start temperature after laser welding. Therefore, an inductive heating has been used to reach 500 °C before laser weld of superposed 1.6mm thick TRIP steel class 750. After welding the temperature was kept constant at 500 °C for more 10 minutes in order to austemper. The microstructures of the welds at high temperature are composed of bainite and residual austenite with an FZ hardness up to 300 HV, compared to 450 HV of the ambient temperature (AT) weld. The HT values of hardness are slightly higher than a traditional post-weld heat treatment (TW), 300 HV compared to 250 HV, because of the tempering kinetics in each case. Erichsen cup indentation tests shown the HT coupons presents better formability compared to the AT or TW conditions. The present contribution highlights a possible solution to the intrinsic brittleness during cold forming of laser welded TRIP 750 steel by applying an inductive in-situ austempering.

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“…There are studies in the literature reporting the weldability and post-weld strength values of DP steels and TRIP steels with welding methods such as gas metal arc welding (GMAW) [13,14], laser beam welding (LBW) [15,16] and resistance spot welding (RSW) [17,18]. There is some studies about advanced high strength steels are used at automotive industry welded by EBW [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

Sezgin

Hayat

2020

Soldag. insp.

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TRIP 800 steel and DP 1000 steel welded by using the electron beam welding (EBW) method were investigated in this study. Martensite was a dominant phase at the fusion zone (FZ) of both steels. In addition, bainite and austenite were observed in the FZ of TRIP 800. The hardness of FZ and heat affected zone (HAZ) of both steels were higher than their base metals. The hardness of FZ of the TRIP 800 joinings was higher than the FZ of DP 1000. Ductility and tensile strength decreased at both of the joinings. However, this decrease became higher at the DP 1000 steel joinings compared to the TRIP 800 joinings. It was observed that the TRIP 800 joining absorbed more energy than the DP 1000 joining at impact notch test for each temperature.

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Effects of the heat input in the mechanical integrity of the welding joints welded by GMAW and LBW process in Transformation Induced Plasticity steel (TRIP) used in the automotive industry

Cited by 9 publications

References 1 publication

Induction Weld Seam Characterization of Continuously Roll Formed TRIP690 Tubes

Induction Weld Seam Characterization of Continuously Roll Formed TRIP690 Tubes

Formability of in-situ Austempered Transformation-induced Plasticity Steels After Laser Beam Welding

The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

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