Determination of optimum welding sequence and distortion forces in steel lattice beams

Özçatalbaş, Yusuf; Vural, H. Ibrahim

doi:10.1016/j.jmatprotec.2008.02.051

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…[20][21][22][23] In friction stir weld sheets, the distortion outcomes are dominated typically by bending and buckling caused by intricate longitudinal stresses. Distortion of Al sheets welded by FSW was measured by average bending distortion H and average longitudinal flexibility f. The average bending distortion H can be computed by…”

Section: Welding Distortion Measurementmentioning

confidence: 99%

“…The welding distortion in a thin sheet structure has many shapes, such as longitudinal shrinkage, transverse shrinkage, angular distortion and longitudinal bending. [20][21][22][23] In friction stir weld sheets, the distortion outcomes are dominated typically by bending and buckling caused by intricate longitudinal stresses. Distortion of Al sheets welded by FSW was measured by average bending distortion H and average longitudinal flexibility f. The average bending distortion H can be computed by…”

Section: Welding Distortion Measurementmentioning

confidence: 99%

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Effect of trailing heat sink on residual stresses and welding distortion in friction stir welding Al sheets

Wang

Wan

et al. 2011

Science and Technology of Welding and Joining

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This paper investigates a trailing heat sink, which was designed and applied to friction stir welding (FSW) in order to control the residual stresses and welding distortion. Residual stresses, residual plastic strains and welding distortion of 2024-T3 and 5083-H321 Al sheets welded by FSW with and without the trailing heat sink were compared. The optimal placement of the heat sink was discussed. The results revealed that the reductions in peak tensile stresses were 66% for 2024-T3 and 58% for 5083-H321 by application of the trailing heat sink in FSW. In addition, the welding distortion could be reduced drastically by this method. The 5083-H321 sheet with a size of 1000610063?5 mm welded by this method was very flat and had almost no distortion. This method achieved in-process control of stresses and welding distortion, without additional complicated work before or after welding operation.

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Section: Welding Distortion Measurementmentioning

confidence: 99%

Section: Welding Distortion Measurementmentioning

confidence: 99%

Effect of trailing heat sink on residual stresses and welding distortion in friction stir welding Al sheets

Wang

Wan

et al. 2011

Science and Technology of Welding and Joining

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“…Geometrik faktörler ve değişik kaynak işlemlerinin etkilerini parametrelerle ifade eden bir ilişki geliştirmek için deneysel sonuçlar kullanılır ve sonra kabul edilebilir yapıların üretimi için izin verilen kaynak prosedürleri belirlenir [3]. Bu Bu çalışmada, özellikle karmaşık ve yoğun kaynaklı birleştirmeler içeren konstrüksiyonlarda oluşabilecek çarpılma eğilimlerinin, çarpılmaya sebep olan kuvvetlerin ölçümüyle belirlenmesi amaçlanmıştır [22,23]. Her tür kaynaklı konstrüksiyonun belirli ölçekte küçültülmüş bir modelinin veya gerçek boyutlardaki prototipinin rijit bir kafes içerisine yerleştirilerek, uygulanan bir kaynak sırası veya kaynak yönteminin oluşturacağı çarpılma eğilimlerinin, üç boyutlu olarak ölçülebilmesi için bir sistem hazırlanmıştır.…”

Section: Introductionunclassified

Çarpılma Kuvvetleriyle Kaynak Sırasının Optimizasyonu ve Çeşitli Uygulamaların Değerlendirilmesi

Özçatalbaş¹

2016

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzetBu çalışmada, kompleks kaynaklı birleştirmeli konstrüksiyonların imalat sürecinde ve sonrasında oluşabilecek çarpılmaların belirlenmesi için yeni bir metot geliştirilmiş ve uygulanmıştır. Kaynaklı birleştirme sürecinde çarpılma kuvvetlerinin ölçülmesi esasına dayanan bu yöntemin uygulanması ile karmaşık kaynaklı yapıların kaynak sıralarının (KS) optimizasyonu yapılabilmektedir. Yöntemin esası, rijit bir kafes hücre içerisine yerleştirilmiş konstrüksiyon modeline uygulanan kaynak sıralarının meydana getirdiği çarpılma kuvvetlerinin ölçülmesine dayanır. Üç boyutlu ölçülen kuvvetlerin yönleri ve şiddetlerine bağlı olarak çarpılma eğilimleri belirlenebilir. Çeşitli KS uygulamalarından elde edilen kuvvetlerin sayısal değerleri kullanılarak yapılan analizlerle çarpılma formları oluşturulabilir. Kaynaklı konstrüksiyonlarda en uygun kaynak sıralarının belirlenmesi ve minimum çarpılma/kalıntı gerilme oluşturulması açısından uygun bir metot olarak değerlendirilmiştir.Anahtar Kelimeler: Kaynaklı konstrüksiyon, Çarpılma, Çarpılma kuvvetleri, Kaynak sırası Optimization of Welding Sequence by Distortion Forces and Evaluation of Some Applications AbstractIn this study, a new method has been developed to determine the distortion tendencies of welded structures, by means of distortion forces, caused by welding process in complex welded structures. During welding process, optimization of complex welding procedures can be done with this method based on measuring of distortion forces. For this purpose, a rigid lattice frame and load cells (LCs), which takes the distortion forces in the welded structures, were designed. Distortions in the some samples, which occur at the welding of connection points, were obtained as forces by means of LCs. Distortion tendencies can be determined depend on direction and intensity of measured forces in 3D space. By using the numerical value of the force obtained from the various welding sequence (WS) applications, representative distortion forms can be created. The method can be used to determine the most appropriate WS and minimal distortion/residual stress in welded structures.

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“…Gannon et al 16 investigated the effect of welding sequence on distortions in large stiffened plate using finite element method. Ozcatalbas et al 17 examined the effect of welding sequence on distortions in large steel lattice beams experimentally. The selection of proper welding sequence for the reduction of either distortions or residual stresses is completely case-dependent and depends on joint details, groove shape, number of passes, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of welding sequence and direction on angular distortions in butt-welded plates

Choobi

Haghpanahi

Sedighi

2011

The Journal of Strain Analysis for Engineering Design

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During arc welding process, non-uniform heating and cooling lead to non-uniform expansion and contraction of the weld and surrounding base metal which result in undesirable residual stresses and distortions in the welded joint. Among different types of welding distortions, angular distortions produced by butt welding of plates are of major concern in industry. Various methods are currently being used to control and reduce angular distortions. Among different types of distortion control methods the ones which can also reduce residual stresses are preferred. In this paper, the effect of welding sequence and direction on reduction of welding-induced angular distortions in single-pass butt-welded 304 stainless plates and also their effect on residual stresses are investigated by numerical simulation. Welding simulation has been performed using a three-dimensional thermo-elastic-plastic finite element model. In order to verify the numerical model, experiments have also been carried out and temperature histories, angular distortions and residual stresses have been measured. The results of this study showed that welding sequence and direction have a great influence on angular distortions. The results revealed that welding symmetrically from center towards the edges of the plate not only decreases angular distortions but also reduces residual stresses. Thus, welding symmetrically from center towards the edges of the plate can be used as a cost-effective method for mitigating angular distortions in butt-welded plates.

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Determination of optimum welding sequence and distortion forces in steel lattice beams

Cited by 13 publications

References 7 publications

Effect of trailing heat sink on residual stresses and welding distortion in friction stir welding Al sheets

Effect of trailing heat sink on residual stresses and welding distortion in friction stir welding Al sheets

Çarpılma Kuvvetleriyle Kaynak Sırasının Optimizasyonu ve Çeşitli Uygulamaların Değerlendirilmesi

Effect of welding sequence and direction on angular distortions in butt-welded plates

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