Laser beam welding with filler metal

Dilthey, Ulrich; Keller, Hubert; Ghandehari, A.

doi:10.1002/srin.199905626

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…When considering welding of thick section joints an autogenous laser beam welding is not always practically feasible and that is why filler metal addition to the welding process is needed. Filler metal can be introduced to the laser process for example, via an arc (laser-arc hybrid) as a molten form or using a cold-wire [6][7][8][9] or pre-heated wire feeding [10,11]. Also pre-set filler metal foil inserts [12,13] associated with the joint fit-up tolerance requirements of the welded parts or for example, metallurgical and mechanical properties required for the produced weldments.…”

Section: Introductionmentioning

confidence: 99%

Filler Metal Mixing Behaviour of 10 mm Thick Stainless Steel Butt-Joint Welds Produced with Laser-Arc Hybrid and Laser Cold-Wire Processes

et al. 2019

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In thick section laser welding, filler metal addition is usually required to improve joint fit-up tolerances or to control the chemical composition of the weld metal. With deep and narrow welds produced using an over-alloyed filler metal, it may be challenging to ensure that the filler metal and its elements are homogeneously mixed and evenly distributed throughout the fusion zone. Inhomogeneous filler metal mixing can cause unfavourable changes to weld metal chemistry and microstructure. Filler metal mixing behaviour in laser-arc hybrid and laser cold-wire welding is studied in this work. Welding tests were conducted on 10 mm thick butt-welded joints of AISI 316L austenitic stainless steel. An overmatching type 2205 duplex stainless steel filler wire was used to obtain a composition contrast between the base metal and filler metal. Energy dispersive spectroscopy (EDS) with chromium as the trace element was used for element mapping and stepwise characterization of the weld cross-section samples. Optical metallography was used to observe possible inhomogeneous filler metal mixing behaviour like local acute changes in macro- and microstructural features. The results showed a clear difference in filler metal mixing between the weld surface part (upper half) of the weld and the weld root part (lower half) in 10 mm thick welded cross-sections for closed root gap of I-groove welds or when the gap was only 0.4 mm. In narrow I-groove preparations, inhomogeneous mixing phenomena were more pronounced in laser cold-wire welds than in laser-arc hybrid welds. In both welding processes, a combination of trailing wire feeding and the use of a wider groove enabled filler metal to be introduced deeper into the bottom of the groove and improved mixing in the root portion of the welds.

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Section: Introductionmentioning

confidence: 99%

Filler Metal Mixing Behaviour of 10 mm Thick Stainless Steel Butt-Joint Welds Produced with Laser-Arc Hybrid and Laser Cold-Wire Processes

et al. 2019

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“…As environmental awareness grows among consumers as well as government agencies, attempts to improve fuel economy in automobiles are accelerating [1,2]. In addition to improved powertrain efficiency, vehicle weight reduction is an important factor.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Welding Process Parameters and Filler Metals on the Weldability and the Mechanical Properties of AA7020 Aluminium Alloy

Adisa

Логинова

Khalil

et al. 2018

JMMP

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This research work aims at finding the optimum process parameters for the laser welding of AA7020 aluminium alloys. The use of 7xxx series alloys is limited because of weldability problems, such as hot cracking, porosity, and softening of the fusion zone despite its higher specific strength-to-weight ratio. AA7020 aluminium alloy was welded while varying the process parameters so as to obtain optimal welding efficiency. The welded samples were analysed to reveal the microstructure, defects, and mechanical properties of the welded zone. The samples were prepared from a plate of AA7020, which was hot rolled at a temperature of 470 • C to a thickness of 1 mm. The welding was carried out at an overlap of 0.25 mm, duration of 14 ms and argon shield gas flow rate of 15 L/min. Process parameters, such as peak power, welding speed, and pulse shaping, were varied. The samples were welded with Al-5Ti-B and Al-5Mg as filler metals. The welding speed, peak power, and pulse shaping have a great influence on the weldability and hot cracking susceptibility of the aluminium alloy. Al-5Ti-B improves the microstructure and ultimate tensile strength of AA7020 aluminium alloy.

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“…In the field of laser beam welding, constant attempts to alter and broaden the application possibilities have been made for years. New laser beam welding methods are appearing constantly, for example, laser welding with filler wire, remote laser welding, laser scanning welding, and so on [10][11][12][13][14][15][16][17][18]. Among these new laser welding methods, laser welding under vacuum or under reduced pressure is one of the most promising methods.…”

Section: Introductionmentioning

confidence: 99%

Laser Welding under Vacuum: A Review

2017

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Laser welding has been widely used in various industry fields. In order to further alter and broaden its applicability, a novel technology of laser welding under vacuum is introduced. The combination of high power laser and low ambient pressure provides an excellent welding performance and quality. In this paper, an overview on laser welding under vacuum is presented. It begins with a short introduction about the research status of laser welding under vacuum. Next, the equipment of laser welding under vacuum is introduced. Then, the fundamental phenomena of laser welding under vacuum, including penetration depth, weld geometry, plasma plume, molten pool and keyhole behaviors, are summarized in detail. Finally, the applications and prospects of laser welding under vacuum are proposed.

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Laser beam welding with filler metal

Cited by 7 publications

References 1 publication

Filler Metal Mixing Behaviour of 10 mm Thick Stainless Steel Butt-Joint Welds Produced with Laser-Arc Hybrid and Laser Cold-Wire Processes

Filler Metal Mixing Behaviour of 10 mm Thick Stainless Steel Butt-Joint Welds Produced with Laser-Arc Hybrid and Laser Cold-Wire Processes

Effect of Laser Welding Process Parameters and Filler Metals on the Weldability and the Mechanical Properties of AA7020 Aluminium Alloy

Laser Welding under Vacuum: A Review

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