Dilution in single pass arc welds

DuPont, J. N.; Marder, A. R.

doi:10.1007/bf02914913

Cited by 60 publications

(65 citation statements)

References 5 publications

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“…With the increase in powder mass flow, more powder is available to be melted, therefore increasing the length of the melt pool, provided that the process is in the mass limited parameter range [26] and laser power is sufficient to melt more powders [27].…”

Section: Melt Pool Sizementioning

confidence: 99%

Effects of Melt Pool Variables and Process Parameters in Laser Direct Metal Deposition of Aerospace Alloys

Shah

Pinkerton

Ahmad

et al. 2010

Materials and Manufacturing Processes

102

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Despite considerable advances in of laser direct metal deposition (LDMD) process optimization, there is rather limited work reported on the effects of melt pool variables on the final deposit characteristics. This article considers the effects of process parameters and melt pool characteristics on the deposition of Inconel 718 powder on a Ti-6Al-4V thin wall. A 1.5 kW diode laser and LDMD system is used to produce a series of deposits. Images of the process are captured using Cu-vapor laser illumination and a high speed camera with long range microscopy optics, and quantitative results are extracted via image analysis. Process parameters such as carrier gas flow rate, powder mass flow rate and laser operating mode (CW and pulsed) and in process variables such as quantified melt pool disturbance, and final part characteristics are correlated and discussed. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and energy dispersive X-ray spectroscopy (EDS) are used to analyze deposited clads in terms of elemental composition and flow characteristics in the deposition melt pool. Melt pool disturbance is found to be a vital parameter in determining the surface roughness of the final part. An inverse relation between the mean surface disturbance of the melt pool and the surface roughness of the part is observed, and carrier gas flow rate and powder mass flow rate both affect the overall melt pool size. The work has implications for the selection of process parameters for commercial laser deposition processes-the speed with which powder is delivered to the melt pool as well as the mass flow rate may need to be taken into account when calculating build rate and for a good surface finish requiring minimum post process finishing a stable melt pool may actually be the worst situation.

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Section: Melt Pool Sizementioning

confidence: 99%

Effects of Melt Pool Variables and Process Parameters in Laser Direct Metal Deposition of Aerospace Alloys

Shah

Pinkerton

Ahmad

et al. 2010

Materials and Manufacturing Processes

102

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“…One of the most widely used methods to solve this problem is the Response Surface Methodology (RSM), in which the experimenter tries to approximate the unknown mechanism with an appropriate empirical model and the function representing this method is called a Response Surface Model. Identifying and fitting a good Response Surface Model from experimental data requires some knowledge of statistical experimental design, bases of regression modeling techniques and elementary optimization methods (Thorpe 1980;Ellis, Garrett 1986;Murugan et al 1993;DuPont, Marder 1996;Doumanidis, Kwak 2002;Correia et al 2005;Palani, Murugan 2007).…”

mentioning

confidence: 99%

Effects of MIG process parameters on the geometry and dilution of the bead in the automatic surfacing

Chotěborský¹,

Navrátilová²,

Hrabě³

2011

Res. Agric. Eng.

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Chotěborský R., Navrátilová M., Hrabě P., 2011. Effects of MIG process parameters on the geometry and dilution of the bead in the automatic surfacing. Res. Agr. Eng., 57: 56-62.Automatic weld surfacing is being employed increasingly in the process, mining and power industries. Gas metal arc welding has become a natural choice for automatic surfacing due to its important properties. These include: high reliability, all positions capabilities, ease of use, low cost and high productivity. With increasing use of gas metal arc welding in its automatic mode, the use of mathematical models to predict the dimensions of the weld bead has become necessary. The development of such mathematical equations using a four factor central factorial technique to predict the geometry of the weld bead in the deposition of OK Tubrodur 15.43 electrode onto structural steel S235JR is discussed. The models developed have been checked for their adequacy and significance by using the F test and the Student's t test, respectively.

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“…É importante entender que nos revestimentos metálicos, onde o material de adição possui propriedades superiores ao material de base, sempre é preferível que os valores de diluição sejam baixos [18,20]. Com baixos valores de diluição, a composição final do revestimento será próxima à composição do material de adição, obtendo assim propriedades superiores na superfície do material de base.…”

Section: Estudo Do Processo Tig Hot-wire Com Materials De Adição Aisi-unclassified

Estudo do Processo TIG Hot-Wire com Material de Adição AISI-316L Analisando o Efeito do Sopro Magnético do Arco sobre a Diluição do Cordão de Solda

Olivares

Díaz

2016

Soldag. insp.

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado. Study of the TIG Hot-Wire Process Using AISI-316L like Addition Material Analyzing the Effect of the Magnetic Blow Arc over Weld Bead DilutionAbstract: The TIG process with Hot-Wire addition is described as a process highly productive, in comparison with conventional TIG process with Cold-Wire, achieved large deposition rates and low dilution percentages, characteristics that permit to the process to be an optimum alternative for cladding applications. There are many options of electrical circuits configurations for to heat the addition wire in the TIG Hot-Wire process, highlighting the utilization of the continuous pulsed current and the alternating current. In the present paper were studied two configurations of the electrical circuit for to heat the addition materials, whom in theory provoke different behaviors in the welding arc, and therefore, in the geometrical properties of the welding bead too. A first analysis done on the welding arc, demonstrate that to heat the wire with continuous constant current is generated a permanent magnetic blow over the arc. According to trials made, the direction and intensity of the magnetic blow will depend of the polarity and of the current value for to heat the wire. A macrographic analysis of the weld beads demonstrated that the best results were for the tests made with Hot-Wire, achieving dilutions until a 2% for a wire velocity of 7,5 m/min, 1kW of power for to heat the wire and it using a welding velocity of 30 cm/min. Key-words:TIG; Hot-Wire; Magnetic blow; Dilution. IntroduçãoAtualmente no mercado existem vários processos para se realizar um revestimento metálico. Dentro dos processos de soldagem que se destacam para realizar esta tarefa encontram-se o MIG/MAG, TIG e o PTA. O processo MIG/MAG oferece uma grande produtividade, mas o aparecimento de respingos sobre o metal de base e os consumíveis da tocha faz com que a qualidade superficial do revestimento seja afetada, além disso, o processo MIG/MAG não se sobressai por possuir um baixo nível de diluição. No caso do processo PTA, ele possui como principal aplicação a realização de revestimentos, devido aos seus baixos níveis de diluição (menores a um 5%) [1], ele acaba por possuir um excelente

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Dilution in single pass arc welds

Cited by 60 publications

References 5 publications

Effects of Melt Pool Variables and Process Parameters in Laser Direct Metal Deposition of Aerospace Alloys

Effects of Melt Pool Variables and Process Parameters in Laser Direct Metal Deposition of Aerospace Alloys

Effects of MIG process parameters on the geometry and dilution of the bead in the automatic surfacing

Estudo do Processo TIG Hot-Wire com Material de Adição AISI-316L Analisando o Efeito do Sopro Magnético do Arco sobre a Diluição do Cordão de Solda

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