CO2 laser welding of interstitial free galvanized steel sheets used in tailor welded blanks

A tailor welded blank (TWB) includes two or more blanks joined together in order to make a single blank. Different welding methods are used to join blanks with different characteristics and form TWBs. In this study, a comparison is made among the effects of three different welding methods namely CO2 laser welding, friction stir welding (FSW), and friction stir vibration welding (FSVW) on mechanical and formability properties of developed TWBs. AA6061 alloy sheets with different thicknesses (1.2 and 0.8 mm) are joined to get TWBs. The forming limit diagram (FLD) and limiting dome height (LDH) are applied to assess the formability. The Taguchi method is applied to find the optimum values of welding parameters. It is concluded that TWBs made by FSVW have higher mechanical properties and formability compared to TWBs made by FSW and CO2 laser welding. The results also indicate that FLD for TWBs made by FSW is higher than FLD for TWBs made by CO2 laser welding and FLD0, for TWBs made by FSVW, increases as vibration frequency increases.

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Analysis of mechanism of plasma and spatter in CO2 laser welding of galvanized steel

Optics & Laser Technology ◽

10.1016/s0030-3992(99)00013-4 ◽

1999 ◽

Vol 31 (2) ◽

pp. 119-126 ◽

Cited By ~ 35

Author(s):

Hyunsung Park ◽

Sehun Rhee

Keyword(s):

Laser Welding ◽

Co2 Laser ◽

Galvanized Steel

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Effectiveness of Stamping Lubricants in Erichsen Test

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.549.325 ◽

2013 ◽

Vol 549 ◽

pp. 325-332

Author(s):

Bora Şener ◽

E.S. Kayali

Keyword(s):

Mechanical Properties ◽

Low Carbon Steel ◽

Galvanized Steel ◽

Interstitial Free ◽

Low Carbon ◽

Normal Anisotropy ◽

Punch Force ◽

Steel Sheets ◽

Effective Lubricant ◽

Erichsen Test

In the present work, formability of ultra low carbon steel sheets (uncoated interstitial free and galvanized steel sheet) has been characterized and the effectiveness of dry and liquid lubricants on formability of these steel sheets was evaluated by using the standard Erichsen test. Primarily, some important mechanical properties of materials like strain hardening coefficient (n), normal anisotropy (r) were determined using the tensile test and formability of these steel sheets has been correlated with these mechanical properties. Then these steel sheets were subjected to the Erichsen test using four different lubricants. Teflon, PVC, Polyethylene films and mineral oil were used in the experiments. Finite element simulations were done using various friction coefficients. Erichsen tests were conducted at 1 kN blank holder force and 2.4 mm/min punch velocity. Values of the Erichsen index and punch force-displacement curves were determined for each lubricant. PVC film proved to be the most effective lubricant for both materials.

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CO2 laser welding of zinc-coated steel sheets

KSME International Journal ◽

10.1007/bf02945721 ◽

1998 ◽

Vol 12 (4) ◽

pp. 606-614 ◽

Cited By ~ 6

Author(s):

Jae-Do Kim ◽

H Na ◽

Chan-Cheol Park

Keyword(s):

Laser Welding ◽

Co2 Laser ◽

Coated Steel ◽

Steel Sheets ◽

Zinc Coated Steel

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Disk Laser Welding of Car Body Zinc Coated Steel Sheets / Spawanie Laserem Dyskowym Blach Ze Stali Karoseryjnej Ocynkowanej

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0465 ◽

2015 ◽

Vol 60 (4) ◽

pp. 2913-2922 ◽

Cited By ~ 7

Author(s):

A. Lisiecki ◽

R. Burdzik ◽

G. Siwiec ◽

Ł. Konieczny ◽

J. Warczek ◽

...

Keyword(s):

Laser Welding ◽

Mechanical Performance ◽

Galvanized Steel ◽

Coated Steel ◽

Butt Joints ◽

Beam Spot ◽

Disk Laser ◽

Car Body ◽

Steel Sheets ◽

Zinc Coated Steel

Autogenous laser welding of 0.8 mm thick butt joints of car body electro-galvanized steel sheet DC04 was investigated. The Yb:YAG disk laser TruDisk 3302 with the beam spot diameter of 200 μm was used. The effect of laser welding parameters and technological conditions on weld shape, penetration depth, process stability, microstructure and mechanical performance was determined. It was found that the laser beam spot focused on the top surface of a butt joint tends to pass through the gap, especially in the low range of heat input and high welding speed. All test welds were welded at a keyhole mode, and the weld metal was free of porosity. Thus, the keyhole laser welding of zinc coated steel sheets in butt configuration provides excellent conditions to escape for zinc vapours, with no risk of porosity. Microstructure, microhardness and mechanical performance of the butt joints depend on laser welding conditions thus cooling rate and cooling times. The shortest cooling time t8/5 was calculated for 0.29 s.

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MECHANICAL PROPERTIES LASER WELDING AUTOMOTIVE STEEL SHEETS

Acta Metallurgica Slovaca ◽

10.12776/ams.v21i3.611 ◽

2015 ◽

Vol 21 (3) ◽

pp. 195

Author(s):

Anna Lišková ◽

Mária Mihaliková ◽

Lukáš Dragošek ◽

Róbert Kočiško ◽

Róbert Bidulský

Keyword(s):

Mechanical Properties ◽

Laser Welding ◽

Welded Joints ◽

Metallographic Analysis ◽

Interstitial Free ◽

Steel Sheets ◽

Interstitial Free Steel ◽

Thin Steel ◽

Micro Alloyed Steel ◽

Automotive Steel

<p>The experimental and theoretical investigation deals with laser welding of automotive thin steel sheets. As tested materials were used Interstitial Free Steel (IF) from type of Hight Strength Low Alloy (HSLA) and the second is S420 steel (Micro-Alloyed Steel). Changes of properties of these materials were carried out by static dynamic conditions. The structure of welded joints these two materials were investigated by metallographic analysis. Metallographic analysis confirmed the formation of favourable structure of weld metal and heat affected zone. Obtained results showed that by laser welding it is possible to create the high quality welded joints with positive mechanical properties on used in automotive industry.</p>

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