Investigations of material hardness and structural changes in the heat-affected zone during plasma cutting

Lazarevic, Andjela; Lazarevic, Dragoljub

doi:10.1007/s40194-017-0510-5

Cited by 8 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was found that when controlling the cutting speed, the topography of the cutting surface and the micro-structure of the thermal influence zone depend on the type of gases used. Investigations of the thermal impact zone for the austenitic plasma cutting of steel with a thickness of 10 -30 mm and cutting speeds of 710 -2030 mm/min, were carried out in [15]. It was found that these factors significantly affect structural changes and the micro-hardness of the zone analysed.…”

Section: Science and Technologymentioning

confidence: 99%

The use of Plackett-Burman plans and the analysis of expert opinions, in order to assess the significance of controllable parameters of the plasma cutting process

Feldshtein¹,

Patalas‐Maliszewska²,

Kłos³

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

View full text Add to dashboard Cite

Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl Eugene FEldshTEin Justyna PATAlAs-MAliszEwskA sławomir kłos Anatol kAłAsznikow krzysztof AndrzEJEwski The use of Plackett-Burman plans and The analysis of experT opinions, in order To assess The significance of conTrollable parameTers of The plasma cuTTing process WykorzysTanie planóW plackeTTa-burmana i analizy opinii eksperTóW W celu oceny isToTności parameTróW sTeroWalnych procesu cięcia plazmoWego*This article evaluates the significance of controllable parameters in the plasma cutting process, using the Plackett-Burman Method and the Analysis of Expert Opinions Method. The plasma cutting process was tested using a WPA-6000 Compakt plasma cutter, on non-alloy steel, of the S235JR EN 10025-2:2007 grade, with a carbon equivalent of 0.35%. The effect of the thickness of the sheet, the current flow rate, the cutting speed, the gas pressure during cutting, the height of the torch during cutting, the pierce delay time and the initial pierce height, were analysed. The research revealed the influence of the controllable parameters tested, in the plasma cutting process, on selected output parameters, surface cut drag lines, the width of the kerf at the inlet and outlet, and the value of the perpendicularity of the kerf on the surface of the base. The greatest influences were recorded for intensity of cutting current, cutting speed and gas pressure during cutting. The results obtained were confirmed by the results of the analysis of expert opinions.

show abstract

Section: Science and Technologymentioning

confidence: 99%

The use of Plackett-Burman plans and the analysis of expert opinions, in order to assess the significance of controllable parameters of the plasma cutting process

Feldshtein¹,

Patalas‐Maliszewska²,

Kłos³

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

View full text Add to dashboard Cite

show abstract

“…Lazarevic and Lazarevic [15] worked on understanding the intensity of the heat impact of a plasma jet on surface layers of stainless steel. Te heat-afected zone is investigated by measurement of its phase content and transformations during the material cooling process.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Cryogenically Treated Copper Nozzle Used in Plasma Arc Machining of S235 Steel

Senthilkumar,

Jayaprakash,

Nagaprasad

et al. 2023

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The investigation was carried out by making use of the design of experiments method in order to achieve its objective, which was to study wear analysis in relation to a cryogenically treated nozzle that was utilized in plasma arc machining. Kerf width and surface roughness are two output characteristics that are key variables in deciding the quality of the cut and the efficiency of the operation. Both of these metrics are outputted by the process. While machining S235 steel, an investigation into the impact that nozzle treatment has on various quality metrics is currently under way. The examination is carried out with the arc voltage, the cutting speed, and the gas pressure, all serving as important components. A cryogenic treatment of the nozzle material using liquid nitrogen at a temperature of −194°C has been attempted in an effort to increase the life of the nozzle. Machining is performed using two different nozzle conditions, such as cryogenically treated and cryogenically untreated, with regard to the input parameter combinations that have been selected. To have a better understanding of the wear behavior of nozzles, an image from a scanning electron microscope is studied. Because of the treatment, the production of wear tracks in the direction that gas flow takes has been drastically decreased. This, in turn, has increased the cutting efficiency by decreasing the amount of arc current that was necessary. In addition, a grey relational analysis is carried out in order to find the best possible machining settings in both conditions. The parameters that were optimized for a nozzle that had been cryogenically treated were 6 bar of gas pressure, 120 amperes of arc current, and 1800 of cutting speed per minute. The use of cryogenic treatment resulted in a reduction of surface roughness by 0.4670 µm and a narrowing of the kerf width by 0.96 mm. It is clear from the SEM pictures of untreated and cryogenically treated nozzles that thermal distortion and wear in the nozzle tip area are minimized to a greater extent in the treated nozzle. This is evidenced by the fact that the treated nozzle has a more uniform appearance.

show abstract

“…They showed that the mean magnitude of microhardness in HAZ increases with increasing laser power and cutting speed. Lazarevie et al [14] measured the hardness distribution in HAZ of X6CrNiMoTi 17-12-2 steel induced by plasma cutting. They found out that the micro-hardness in the HAZ increases compared to the BM hardness due to the change in the grain size.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the thermal and mechanical cutting influence on the cut-edge hardness of structural steels S355 and S1100

Diekhoff,

Sun,

Nitschke-Pagel

et al. 2023

Preprint

View full text Add to dashboard Cite

Thermal and mechanical cutting process are commonly applied in manufacturing industries for making a specific size and shape of samples. The material properties of the heat-affected metal at the cut edge might be different from that of the parent metal. Hardness as a very important parameter for the assessment of material properties has been widely used in the design procedure. The vickers hardness test is a versatile method to measure material hardness in practice. In this study, the comparison of cut-edge hardness between the thermal and mechanical cutting process was performed on the structural steels S355 and S1100 by using the experimental method. Based on the measurements, the influence of Vickers test load on the magnitude and distribution of cut-edge hardness for laser cut samples of steels S355 and S1100 was clarified. Furthermore, the effects of cutting processes on the hardness were illustrated. Finally, the comparison between the distribution characteristic of the cut-edge hardness of steels S355 and S1100 were made.

show abstract

Investigations of material hardness and structural changes in the heat-affected zone during plasma cutting

Cited by 8 publications

References 12 publications

The use of Plackett-Burman plans and the analysis of expert opinions, in order to assess the significance of controllable parameters of the plasma cutting process

The use of Plackett-Burman plans and the analysis of expert opinions, in order to assess the significance of controllable parameters of the plasma cutting process

Effect of the Cryogenically Treated Copper Nozzle Used in Plasma Arc Machining of S235 Steel

A comparative study of the thermal and mechanical cutting influence on the cut-edge hardness of structural steels S355 and S1100

Contact Info

Product

Resources

About