Autogeneous Laser and Hybrid Laser Arc Welding of T-joint Low Alloy Steel with Fiber Laser Systems

Unt, Anna; Lappalainen, Esa; Salminen, Antti

doi:10.1016/j.phpro.2013.03.062

Cited by 11 publications

(10 citation statements)

References 5 publications

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Section: H I G H L I G H T S unclassified

“…Bir başka ifade ile hazırlanan 2 adet eğme numunesinden 1 tanesi 180° eğilmiş diğer numune ise küçük eğme açılarında hasara uğrayarak kaynak metalinden kırılmıştır. 16…”

Section: Eğme Deneyi (Bending Test)unclassified

“…[13], özlü tel ile gazaltı kaynak yöntemi, Lee vd. [14], basitleştirilmiş elektro gaz ark (simplifed electro-gas arc welding) kaynak yöntemi, Tsirkas vd., [15] lazer kaynağı, Unta vd., [16,17] [19], E40 çeliğini 0,5 m derinlikte titanyum tipi kendinden korumalı flux-özlü tel ile sualtında, Li vd. [20], 304L paslanmaz çelik ve düşük alaşımlı 16Mn'lı çelikleri 0,3 m derinlikte kendinden korumalı özlü teller kullanarak, Fu vd.…”

Section: H I G H L I G H T S unclassified

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Gerçek deniz ortamında su altı kaynağı ile birleştirilen Grade AH36 gemi sacının kaynak bölgesinin karakterizasyonu

Çolak¹,

Ayan²,

Kahraman³

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Welding process at real underwater conditions  Weldability of Grade AH36 steel sheep plate at real underwater with different depths  Microstructural and mechanical properties of the welded joints Figure A. Flowchart of the study Purpose: The main aim of this study was to investigate weldability of low carbon Grade AH36 steel ship plate at the real marine conditions with different water depths. Theory and Methods: Grade AH36 steel ship plate frequently used for off shore applications was joined at both the atmospheric and real underwater conditions with different water depths through shielded metal arc welding process. The welded specimens firstly subjected to visual inspection and this was followed by the radiographic test. Microhardness, bending, impact toughness tests were also carried out in order to determine the mechanical properties of the joints. Microstructural examines were performed to examine the structural transformation on the weld zones. Results: Microstructural and mechanical properties of the welded specimens at both the atmospheric and real under water conditions were evaluated in detail. From the results of visual inspection test; some welding defects were seen on the samples joined at underwater. It was determined from the microhardness test; for all specimens, micro hardness values of the weld metal were lower than the HAZ and higher than the base metal. Samples joined under the atmospheric conditions has about 50% higher impact toughness value than the samples joined at underwater. Microstructural examines show that specimens joined underwater presented approximately 25-50% narrower HAZ than the specimens joined at atmospheric conditions. Conclusion: This study presents better understanding case of the welding process at real underwater conditions. The study also deals with weldability of Grade AH36 steel and comparison between atmospheric and real underwater conditions.

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Section: H I G H L I G H T S unclassified

“…Bir başka ifade ile hazırlanan 2 adet eğme numunesinden 1 tanesi 180° eğilmiş diğer numune ise küçük eğme açılarında hasara uğrayarak kaynak metalinden kırılmıştır. 16…”

Section: Eğme Deneyi (Bending Test)unclassified

Section: H I G H L I G H T S unclassified

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Gerçek deniz ortamında su altı kaynağı ile birleştirilen Grade AH36 gemi sacının kaynak bölgesinin karakterizasyonu

Çolak¹,

Ayan²,

Kahraman³

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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“…The application of HLAW technology to T-joints is still limited, especially on thick plates. One of the most commonly adopted configurations for researchers to weld T-joints is a flat position (1F/PA) with 8 mm thickness [22][23][24]. These experiments showed sound full penetration welds when flange plates were at a fixed setting and an inclination angle with respect to the horizontal plane between 30 • and 45 • .…”

Section: Introductionmentioning

confidence: 99%

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Churiaque

Sánchez-Amaya

Porrúa-Lara³

et al. 2021

Metals

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The present contribution is the first research reporting full penetration HLAW joints in 15 mm thick EH36 steel butt T-welds with square grooves on 2F welding position by single-sided welding. The effects of welding parameters were investigated to increase the quality of the joints. Conditions leading to defect-free full penetration welds fulfilling naval regulations includes a laser power of 12.5 kW, a welding speed of 1.6 m/min and the vertical laser offset distance from the flange of 1 mm. Advanced characterization of selected welds included a microstructural identification by optical microscopy, SEM, and XRD, revealing the presence of acicular, polygonal and Widmanstätten ferrite, lath martensite, and some retained austenite at FZ. Hardness and microhardness mapping tests showed values of 155 HV at base metal and 200 to 380 HV at the fusion zone connecting the web to the flange.

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“…Both processes are flexible, easily automatable and adaptable to manufacturing conditions in workshop or in field. Fillet welding with laser can be performed with various different techniques, autogenously and as a combination with arc welding processes as shown by Unt, et al (2013). It has been shown that hybrid laser welding is also suitable for fillet joint welding in case of aluminum by Wang Tao, et al (2013) andMazar Atabaki, et al, (2014).…”

Section: Introductionmentioning

confidence: 99%

Effects of Sealing Run Welding with Defocused Laser Beam on the Quality of T-joint Fillet Weld

2014

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Fillet weld is the predominant weld type used for connecting different elements e.g. in shipbuilding, offshore and bridge structures. One of prevalent research questions is the structural integrity of the welded joint. Post weld improvement techniques are being actively researched, as high stress areas like an incomplete penetration on the root side or fluctuations in penetration depth cannot be avoided. Development of laser and laser-arc hybrid welding processes have greatly contributed to increase of production capacity and reduction of heat-induced distortions by producing single pass full penetration welds in thin-and medium thickness structural steel parts. Present study addresses the issue of how to improve the quality of the fillet welds by welding the sealing run on the root side with defocused laser beam. Welds having incomplete or excessive penetration were produced with several beam angles and laser beam spot sizes on surface. As a conclusion, significant decrease or even complete elimination of the seam irregularities, which act as the failure starting points during service, is achieved.

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Autogeneous Laser and Hybrid Laser Arc Welding of T-joint Low Alloy Steel with Fiber Laser Systems

Cited by 11 publications

References 5 publications

Gerçek deniz ortamında su altı kaynağı ile birleştirilen Grade AH36 gemi sacının kaynak bölgesinin karakterizasyonu

Gerçek deniz ortamında su altı kaynağı ile birleştirilen Grade AH36 gemi sacının kaynak bölgesinin karakterizasyonu

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Effects of Sealing Run Welding with Defocused Laser Beam on the Quality of T-joint Fillet Weld

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