Wyniki wyszukiwania - BazTech

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Wpływ warunków technologicznych spawania metodą MIG/MAG na sposób przenoszenia metalu w łuku spawalniczym

Rykała J., Pfeifer T.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2011

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R. 55, nr 6

34-40

PL

Przedstawiono wyniki badań dotyczące wpływu warunków technologicznych spawania metodą MAG z wykorzystaniem nowoczesnych urządzeń inwertorowych na sposób przenoszenia metalu w łuku spawalniczym MAG z wykorzystaniem spoiw i gazów osłonowych typowych dla stali niestopowych i wysokostopowych. Omówiono przebieg i specyfikę prowadzonych badań oraz podstawowe aspekty związane ze sposobem przenoszenia ciekłego metalu w łuku metody MAG. Zaprezentowano wybrane wyniki badań w formie tablic przedstawiających zakresy parametrów prądowo - napięciowych dla wytypowanych układów drut elektrodowy - osłona gazowa i poszczególnych sposobów przenoszenia metalu. Zwrócono uwagę, że opracowane wyniki mogą mieć zastosowanie przy określaniu sposobów przenoszenia metalu podczas tworzenia instrukcji WPS oraz protokołów WPQR.

EN

Results of investigations on the effect of MAG welding technological conditions with using filler metals and shielding gases typical for unalloyed and high-alloy steels on metal transfer phenomenon have been presented. The course of investigation and the tables including ranges of parameters for specific types of metal transfer have been presented for different sets of electrode wires and shielding gases. It has been concluded that the test results can be used for preparation of WPSs and WPQRs when the determination of metal transfer type is required.

2

Relationship between wire feed speed and metal transfer in GMAW

Węglowski M. S., Huang Y., Zhang Y.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 29, nr 2

191-194

EN

Purpose: This paper presents the results of an investigation of the metal transfer. The main goal of the investigation was to check that using narrow band filter and high speed digital video camera can be used, without a back-lighting laser, to observe the metal transfer process. Presented are the influence of wire feed rate (welding current) on droplet diameter, droplet trajectory and velocity. Design/methodology/approach: The experiments were carried out on an automated welding table. A high speed video camera "Olympus i-SPEED" was used. For each welding wire feed speed the image of metal transfer and welding parameters (welding current, arc voltage and wire feed rate) were recorded. Findings: Results presented in this paper indicate that the wire feed has a sig.nificant influence on droplet diameter, droplet trajectory and droplet velocity. That method based on digital high speed camera and narrow band filter is very sensitive to the changes of welding conditions and should be used as a tool for monitoring of the GMAW process. Research limitations/implications: The high speed video camera is an expensive instrument and it can be used only as a laboratory tool in monitoring and optimizing of welding processes. Practical implications: The achieved experience allows directing further research on the metal transfer in GMAW and studying the possibilities of using this method in other welding processes. Originality/value: The new method for monitoring metal transfer based on narrow band filter and high speed digital camera does not require He-Ne laser to provide the back-lighting in order to observe the metal transfer process. This method is cheaper and easier to use. The original results of these investigations are mathematic descriptions of droplet flight trajectory and droplet velocity.

3

Kinematyka przenoszenia ciekłego metalu w łuku spawalniczym metody MIG

Węglowski M. S.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2008

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R. 52, nr 1

29-32

PL

Przedstawiono wyniki badań procesu przenoszenia ciekłego metalu w łuku spawalniczym metody MIG. Obliczono równanie ruchu za pomocą wielomianu trzeciego stopnia dla pojedynczej kropli. Podano zmiany prędkości i przyśpieszenia w funkcji czasu, a tym samym położenia kropli w łuku spawalniczym. Wykazano, że metoda badania procesu przenoszenia metalu w łuku spawalniczym oparta na filtrze wąskopasmowym i bez konieczności stosowania lasera He-Ne jest bardzo użyteczną techniką.

EN

The work reports the results obtained with using digital high speed video camera to investigate the metal transfer process in MIG welding. The mathematic description of droplet flight trajectory, droplet velocity and acceleration is presented. To calculate the droplet flight trajectory the polynomial regression of the 3rd degree was used. The new method of monitoring of the metal transfer based on the narrow band filter does not require He-Ne laser to observe the metal transfer. The method is cheaper and easier to use. The gained experience allows to direct further research on the metal transfer and possibilities of using this simple method for on-line monitoring of welding processes on automated and robotized stands.

4

Effect of welding current on metal transfer in GMAW

Węglowski N., Huang Y., Zhang Y.

Archives of Materials Science and Engineering

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2008

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Vol. 33, nr 1

49-56

EN

Purpose: The paper presents findings related to the influence of welding current on metal transfer in GMAW. The main goal was to understand how droplet diameter, droplet velocity and droplet transfer rate change with the wire feed speed which determines the welding current. Design/methodology/approach: The experimental station was designed and built. A high speed video camera "Olympus i-SPEED" was used. The investigations were conducted on an automated GMAW platform. For each wire feed speed the images of metal transfer and welding parameters were recorded. Findings: Research results presented in this paper indicate that the wire feed speed (welding current) has a significant influence on droplet diameter, droplet velocity and transfer rate. The new method based on narrow band filter for imaging is much more sensitive to the changes of welding conditions and should be used as a tool for monitoring of GMAW process. Research limitations/implications: The high speed video camera is an expensive instrument and it can be used only as a laboratory tool in monitoring and optimizing of welding processes. Practical implications: The gained experience will help to determine the further directions for the research on metal transfer in GMAW and help the authors to be prepared for studying the CMT welding process. This methodology will be particularly attractive for welded - structures manufacturing industry because it could significantly reduce the cost of production by optimizing welding parameters. Originality/value: The new method for monitoring metal transfer based on narrow band filter does not require He-Ne laser to be placed ob the opposite of the imaging plane to generate a shadow. This method is thus more compact and easier to use. The original results of these investigations are mathematic descriptions of droplet flight trajectory and droplet velocity.