Comparative study: Mechanical and metallurgical aspects of tailored welded blanks (TWBs)

Bayraktar, E.; Kaplan, D.; Yilbaş, Bekir Sami

doi:10.1016/j.jmatprotec.2007.11.088

Cited by 27 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While there are many welding methods to produce TWBs, this report will focus on tailored blanks produced by laser welding (LWB). The advantages of laser welding to produce TWBs include ease of welding different steels (grade, thickness, and coating), narrow weld and heat affected zone (HAZ), relatively low geometric distortion, relatively high welding speed and high penetration [1]. Over the last several years, LWB has gained wide acceptance in body structure applications (for example, door rings, door inner panels, B-pillars, sills, floors, etc.).…”

Section: Industrial Relevancementioning

confidence: 99%

Fatigue behavior of 590MPa Tensile Strength galvanneal coated sheet steel laser welded blanks

2018

View full text Add to dashboard Cite

Abstract. The use of Laser Welded Blanks (LWBs) with different grade/gauge combinations in automotive body structures is well established; however, the acceptance of LWBs in fatigue critical chassis and underbody components has been slower because of lack of reliable models for durability assessment of laser welded joints (LWJ). Most prior fatigue studies of LWBs are carried out in tension -tension loading mode, making it difficult to relate it to the cyclic deformation and fatigue behaviors of the substrate steel grade. In contrast, in this study, LWJ is conceptualized as a "notch" to estimate the local stresses from the strain -life data of the parent grade and the fatigue notch concentration factor (Kf) is estimated from the nominal stress values of LWJ. The method is illustrated with strain controlled fatigue data for 1.4 mm galvanneal coated 590 MPa steel and fully reversed, fatigue data for homogeneous and heterogeneous LWB combinations. The results indicate that for both homogeneous and heterogeneous LWJ configurations, Kf increases with fatigue life, but tends to saturate at life levels greater than about million cycles. Considering 10 5 cycles to failure as an example, Kf is estimated as 1.07 for the homogeneous and 1.25 for the heterogeneous combinations.

show abstract

Section: Industrial Relevancementioning

confidence: 99%

Fatigue behavior of 590MPa Tensile Strength galvanneal coated sheet steel laser welded blanks

2018

View full text Add to dashboard Cite

show abstract

“…A common way of joining different blanks is welding [4]. In most cases the joining has great influence on successive forming operations due to varying local mechanical properties, which makes novel manufacturing techniques desirable [3]. Moreover tailored blanks produced by forming show improved mechanical properties such as high strength and a homogenous grain structure, but the reachable geometric design is restricted.…”

Section: Tailored Blanksmentioning

confidence: 99%

“…. In most cases the joining has a significant influence on the consecutively forming process due to varying local mechanical properties [3]. Hence the manufacturing of tailored blanks with a defined sheet thickness characteristic by the process class "sheet-bulk metal forming" is investigated.…”

mentioning

confidence: 99%

Investigation Of Tailored Blank Production By The Process Class Sheet-Bulk Metal Forming

Merklein¹,

Opel²

2011

AIP Conference Proceedings

View full text Add to dashboard Cite

Low field permittivity of ferroelectric-ferrite ceramic composites: Experiment and modeling J. Appl. Phys. 112, 094103 (2012) Synthesis and efficient near-infrared quantum cutting of Pr3+/Yb3+ co-doped LiYF4 single crystals J. Appl. Phys. 112, 073518 (2012) Feasibility study in application of forging waste heat on absorption cooling system J. Renewable Sustainable Energy 4, 053109 (2012) Growth of (111) oriented NiFe2O4 polycrystalline thin films on Pt (111) via sol-gel processing J. Appl. Phys. 112, 063908 (2012) Large size metallic glass gratings by embossing J. Appl. Phys. 112, 064505 (2012) Additional information on AIP Conf. Proc. . In most cases the joining has a significant influence on the consecutively forming process due to varying local mechanical properties [3]. Hence the manufacturing of tailored blanks with a defined sheet thickness characteristic by the process class "sheet-bulk metal forming" is investigated. Subsequent the tailored blanks are provided for forming operations such as deep-drawing and the direct forming of complex functional shape elements. Aim of the project is the manufacturing of circular blanks with a sheet thickening in the exterior area by an upsetting operation. At the beginning, FE-based studies and physical experiments using blanks of DC04 are carried out, to create a fundamental knowledge base of the forming process. A comparatively large contact area between blank and forming tool, a threedimensional material flow and the low sheet thickness cause high process forces. Building up a multi-stage upsetting process with different sequenced tool geometries is one approach to meet this challenge. The material flow out of the sheet center is realized step-by-step to lower the actual contact area and sequential the appearing forces.

show abstract

“…All of these phenomena become important factors, influencing the quality of welding structure and the usable capability. Understanding the thermal process of welding is crucial to analyse the mechanical welding structure and microstructure as well as controlling of welding quality [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

The Fatigue Strength of AISI 430—304 Stainless Steels Welded by CO$_{2}$ Laser Beam Welding

Çalıgülü¹,

Türkmen²,

Özer³

et al. 2016

Metallofiz. Noveishie Tekhnol.

View full text Add to dashboard Cite

In this study, the fatigue strength of AISI 430-304 stainless steels welded by CO 2 laser beam welding (LBW) is investigated. Laser welding experiments are carried under helium atmosphere at 2000, 2250 and 2500 W welding powers with 100 cm/min welding speed. The welding zones are examined by optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy analysis. Fatigue tests are performed using an axial fatigue test machine, and the fatigue strength is analysed drawing S-N curves and critically observing fatigue fracture surfaces of the tested samples. The experimental results indicate that mechanical properties and microstructural features are affected significantly by welding power. The fatigue strength of CO 2 laser welded samples increase due to higher deep penetration in welding zone with increasing welding power in chosen conditions. The best properties are observed with the specimens welded at 2500 W heat input and 100 cm/min welding speed.В цій роботі досліджено втомну міцність неіржавійних сталей AISI 430-304, зварених променем CO 2 -лазера. Експерименти з лазерного зварюван-ня виконувалися в атмосфері гелію за потужности зварювання у 2000, 2250 і 2500 Вт із швидкістю зварювання у 100 см/хв. Зони зварювання досліджувалися методами оптичної мікроскопії, сканівної електронної мікроскопії та енергодисперсійної спектроскопії. Дослідження на втому виконувалися з використанням машини для випробувань на вісну втому, а втомна міцність аналізувалася шляхом побудови S-N-кривих та крити- U. CALIGULU, M. TURKMEN, A. OZER, M. TASKIN, and M. OZERчного спостереження поверхонь втомного руйнування досліджених зраз-ків. Експериментальні результати показують, що механічні властивості та мікроструктурні особливості значно залежать від потужности зварю-вання. Втомна міцність зразків, зварених CO 2 -лазером, зростає завдяки збільшенню глибини проникнення в зоні зварювання зі збільшенням по-тужности зварювання за обраних умов. Найкращі властивості спостеріга-лися у зразків, зварених за підведеної теплоти при 2500 Вт та швидкости зварювання у 100 см/хв.В данной работе исследована усталостная прочность нержавеющих сталей AISI 430-304, сваренных лучом CO 2 -лазера. Эксперименты по лазерной сварке выполнялись в атмосфере гелия при мощностях сварки 2000, 2250 и 2500 Вт и скорости сварки 100 см/мин. Зоны сварки исследовались ме-тодами оптической микроскопии, сканирующей электронной микроско-пии и энергодисперсионной спектроскопии. Испытания на усталость про-изводились с использованием машины для испытаний на осевую уста-лость, а усталостная прочность анализировалась путём построения S-N-кривых и критического наблюдения поверхностей усталостного разруше-ния исследованных образцов. Экспериментальные результаты показыва-ют, что механические свойства и микроструктурные особенности значи-тельно зависят от мощности сварки. Усталостная прочность образцов, сваренных CO 2 -лазером, возрастает благодаря увеличению глубины про-никновения в зоне сварки с увеличением мощности сварки при выбран-ных условиях. Наилучшие св...

show abstract

Comparative study: Mechanical and metallurgical aspects of tailored welded blanks (TWBs)

Cited by 27 publications

References 12 publications

Fatigue behavior of 590MPa Tensile Strength galvanneal coated sheet steel laser welded blanks

Fatigue behavior of 590MPa Tensile Strength galvanneal coated sheet steel laser welded blanks

Investigation Of Tailored Blank Production By The Process Class Sheet-Bulk Metal Forming

The Fatigue Strength of AISI 430—304 Stainless Steels Welded by CO$_{2}$ Laser Beam Welding

Contact Info

Product

Resources

About