Parameter Optimization for Laser Welding of High Strength Dissimilar Materials

2019 ◽  
Vol 969 ◽  
pp. 558-564 ◽  
Author(s):  
M. Anuradha ◽  
Vemulapalli Chittaranjan Das ◽  
D. Venkateswarlu ◽  
Muralimohan Cheepu
Keyword(s):  
Optimization Technique ◽  
Laser Beam Welding ◽  
Dissimilar Materials ◽  
High Strength ◽  
Regression Equations ◽  
Surface Response Methodology ◽  
Weld Geometry ◽  
Predicted Values ◽  
Selection Of

Dissimilar joining of high strength tensile steels are joined using laser beam welding. The selection of the welding conditions for joining of dissimilar materials is highly required to satisfy the quality of the joints. In the present investigation, optimization technique were used to determine the optimal welding conditions. Initially welding conditions were optimized for weld geometry and formation of different zones in the weldment. The metallurgical and mechanical properties of the welds are greatly influenced by the geometry of the welds. The surface response methodology design is carried out for the experimental design by the development of regression equations. Analysis of variance (ANOVA) was used to check the validity of the model. The output of the welding conditions were compared with the predicted values to identify the accuracy of the model. The obtained results from response surface methodology were compared with the experimental results and validated.

Optimization of Process Parameters Using Surface Response Methodology for Laser Welding of Titanium Alloy

2019 ◽  
Vol 969 ◽  
pp. 539-545 ◽  
Author(s):  
Muralimohan Cheepu ◽  
D. Venkateswarlu ◽  
P. Nageswara Rao ◽  
S. Senthil Kumaran ◽  
Narayanan Srinivasan
Keyword(s):  
Titanium Alloy ◽  
Laser Welding ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Bead Geometry ◽  
Regression Equations ◽  
Surface Response Methodology ◽  
Surface Response ◽  
Metallurgical Properties

Laser beam welding input conditions are greatly influence the quality of the welded joints and they have significant role on the controlling of their strength and metallurgical properties. The metallurgical properties and weld bead geometry and mechanical properties of the joints determine the quality of the joints. In this study, the fusion zone width, penetration, width of the heat affected zone and strength of the titanium alloy welds were investigated using laser welding process. The surface response methodology design is carried out for the experimental design by the development of regression equations. Analysis of variance (ANOVA) was used to check the validity of the model. In order to identify the significant parameters, student’s test is conducted. The obtained results from response surface methodology were compared with the experimental results and validated.

Investigation on Joining Method Replacement for Vehicle Body’s Assembly

2011 ◽  
Vol 189-193 ◽  
pp. 3621-3624
Author(s):  
Jian Lin ◽  
Yi Zhong ◽  
Yong Ping Lei
Keyword(s):  
Shear Failure ◽  
Design Method ◽  
Laser Beam Welding ◽  
Dissimilar Materials ◽  
High Strength ◽  
Failure Criteria ◽  
Vehicle Body ◽  
Welding Arc ◽  
Bonded Joint ◽  
Equivalent Strength

Various joining methods (i.e., spot welding, arc welding, laser beam welding) have been used for vehicle body assembly. However it is unclear for the equivalent conversion of various joints which has the equivalent joint strength for the vehicle body, such as weld-bonded joint, SPR joint, which have been considered likely to replace RSW in the area of high strength steel’s joining. In order for the flexible design in the auto line of vehicles body’s joining, the equivalent (strength) weld pitch design method for various joints, including the joining of similar and dissimilar materials, is presented in this work. And some primary simulating results are presented and discussed. It is shown that the conversion method for various joints can be established based on the joint’s shear failure criteria. And the conversion results can be influenced by the sheet gage obviously. The failure criteria of various joint still need further investigation based on the simulating and experimental results.

scholarly journals Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1135 ◽  
Author(s):  
Sohail Yasin ◽  
Danmei Sun ◽  
Hafeezullah Memon ◽  
Feichao Zhu ◽  
Han Jian ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Mechanical And Thermal Properties ◽  
Regression Equations ◽  
Surface Response Methodology ◽  
Melt Flow Rate ◽  
Operational Conditions ◽  
Surface Response ◽  
Predicted Values ◽  
Rsm Model ◽  
Blend Ratios

Optimization of the mechanical and thermal properties of isotactic polypropylene (iPP) homopolymer blended with relatively new low molecular low modulus polypropylene (LMPP) at different blend ratios was carried out via surface response methodology (RSM). Regression equations for the prediction of optimal conditions were achieved considering eight individual parameters: naming, elongation at break, tensile strength and elastic modulus, crystallization temperature (TC), first melting temperatures (TM1), heat fusion (Hf), crystallinity, and melt flow rate (MFR), which were measured as responses for the design of experiment (DOE). The adjusted and predicted correlation coefficient (R2) shows good agreement between the actual and the predicted values. To confirm the optimal values from the response model, supplementary experiments as a performance evaluation were conducted, posing better operational conditions. It has been confirmed that the RSM model was adequate to reflect the predicted optimization. The results suggest that the addition of LMPP into iPP could effectively enhance the functionality and processability of blend fibres if correctly proportioned.

scholarly journals Effect of SLM Process Parameters on the Quality of Al Alloy Parts; Part II: Microstructure and Mechanical Properties

2018 ◽  
Author(s):  
Ahmed H. Maamoun ◽  
Yi F. Xue ◽  
Mohamed A. Elbestawi ◽  
Stephen C. Veldhuis
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
High Strength ◽  
Al Alloy ◽  
Microstructure And Mechanical Properties ◽  
Wide Range ◽  
Powder Characteristics ◽  
High Strength Aluminum Alloys ◽  
Selection Of

Additive manufacturing (AM) provides customization of the microstructure and mechanical properties of components. Selective laser melting (SLM) is the commonly used technique for processing high strength Aluminum alloys. Selection of SLM process parameters could control the microstructure of fabricated parts and their mechanical properties. However, process parameter limits and defects inside the as-built parts present obstacles to customized part production. This study is the second part of a comprehensive work that investigates the influence of SLM process parameters on the quality of as-built Al6061 and AlSi10Mg parts. The microstructure of both materials was characterized for different parts processed over a wide range of SLM process parameters. The optimized SLM parameters were investigated to eliminate the internal microstructure defects. Mechanical properties of the parts were illustrated by regression models generated with design of experiment (DOE) analysis. The results reported in this study were compared to previous studies, illustrating how the process parameters and powder characteristics could affect the quality of produced parts.

Process Feasibility Analysis of Self-Pierce Riveting High Strength Low Alloy Steel

2010 ◽  
Author(s):  
L. Han ◽  
M. Thornton ◽  
R. Hewitt ◽  
A. Chrysanthou ◽  
M. Shergold
Keyword(s):  
Spot Welding ◽  
Hsla Steel ◽  
Sheet Material ◽  
Dissimilar Materials ◽  
High Strength ◽  
Feasibility Analysis ◽  
Low Alloy Steel ◽  
Automotive Body ◽  
Body In White ◽  
Selection Of

Self-Piercing Riveting (SPR) has been widely used in automotive Body in White (BIW) assembly as an alternative to Resistance Spot Welding (RSW), in particular for joining of dissimilar materials, for example Steels to Aluminium. A study examining the process feasibility of SPR of Aluminium alloy AA5754 and High Strength Low Alloy (HSLA) steel in various thicknesses has been conducted. It has been shown that the process is capable of joining the two materials together. However, it was also observed that the selection of rivet and die is limited when joining HSLA. The setting force required to drive the rivet into the sheet material to be joined tends to be high. This leads to potential tooling life concerns. It was also shown that the arrangement of the high strength steel joined to aluminium can have a significant effect on the process feasibility.

scholarly journals Kajian Perbandingan Penggunaan Berbagai Merek Semen Dengan Dan Tanpa Perawatan Terhadap Kuat Tekan Dan Kuat Lentur Beton Pada Perkerasan Kaku

2018 ◽  
Vol 18 (2) ◽  
pp. 33-42
Author(s):  
Sugeng Wiyono ◽  
Zulhendri Zulhendri ◽  
Mohd. Alfajrizal ◽  
Anas Puri
Keyword(s):  
Bending Strength ◽  
High Strength ◽  
Cement Concrete ◽  
Age Range ◽  
Selection Of ◽  
Better Than ◽  
Curing Cement

[ID] Semen merupakan suatu bahan pembentuk beton yang berperan sangat penting untuk mencapai mutu yang direncanakan. Selain pemilihan jenis merek semen, salah satu cara untuk mendapatkan kualitas beton yang baik yaitu dengan cara melakukan perawatan. penelitian ini bertujuan untuk mengetahui sejauh mana kualitas tiga merek semen terhadap kuat tekan dan kuat lentur beton disamping itu juga bertujuan untuk mengetahui seberapa besar perbedaan kekuatan dari masing- masing merek semen terhadap beton yang dirawat dan tanpa dirawat. Pada penelitian ini menggunakan metode eksperimental yang sesuai dengan SK SNI T-15-1990-03. Penelitian ini menggunakan semen  Padang, semen Holcim, dan semen Bosowa, dengan menggunakan jenis perawatan perendaman pada sampel beton, pengujian yang dilakukan adalah pengujian kuat tekan dan kuat lentur dengan mutu rencana fc 30 MPa dengan umur 7, 14, 28, dan 56 hari, untuk masing-masing umur dibuat 3 benda uji dirawat dan 3 benda uji tidak dirawat. Dari hasil uji kuat tekan rata-rata semen padang memiliki kekuatan 32,65 MPa, semen holcim 31,33 MPa dan semen bosowa  30,86 MPa. Sedangkan untuk pengujian kuat lentur semen padang 4,35 MPa, semen holcim 4,23 MPa dan semen bosowa 4,18MPa, sementara beton yang tidak dirawat memiliki nilai lebih rendah dari beton yang dirawat.. Dari hasil pengujian tersebut dapat dilihat bahwa pemakaian merek semen perlu diperhatikan karakteristiknya serta perawatan mempunyai konstribusi yang cukup besar dalam mendapatkan mutu beton hasil pelaksanaan. [EN] The cement concrete as product that consit of several element which is important for achieve the quality that be planed. To choose same kriteria for getting the good quality of concrete, one of way are choosing the brand of cement and doing curing. Therfore, the aim of this research is ro know about the strength of of each brand of cement toword cured and uncuret concrete. This research used cement padang, cement holcim, cement bosowa with soaking treatments of concrete samples. The used of the tests are compresive and bending strength of concrete with using quality plan fc’ 30 MPa and age range 7, 14, 28 and 56 days. The cement padang is better than others cement and by getting the the highest value also found cement Padang has the sensitivity to the curing. Cement Bosowa got high strength at the beginning of the age and for cement Holcim is relativity stable with the age. From the researh, knowed that is important the selection of cement brand and curing to get the good result consist of the quality by yhe first plan.

Effect of Process Parameters and Heat Input on Weld Bead Geometry of Laser Welded Titanium Ti-6Al-4V Alloy

2019 ◽  
Vol 969 ◽  
pp. 613-618 ◽  
Author(s):  
Muralimohan Cheepu ◽  
D. Venkateswarlu ◽  
P. Nageswara Rao ◽  
S. Senthil Kumaran ◽  
Narayanan Srinivasan
Keyword(s):  
Laser Welding ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
High Strength ◽  
Industrial Applications ◽  
Weld Bead ◽  
Bead Geometry ◽  
Weld Bead Geometry ◽  
Weld Geometry ◽  
Welding Technique

Laser beam welding is one of the most favorable welding technique and its importance in industry is demanding due to higher welding speeds and lower dimensions and distortions in the welds. Moreover, its high strength to weld geometries and minimal heat affected zones makes favorable for various industrial applications. In the present study, laser welding of titanium alloy was investigated to observe the effects of parameters on the bead geometry and metallurgical properties. The laser power and welding speeds were varied to identify their impact on the formation of weld geometry. The width and depth of the fusion zone is varied with welding conditions. The finer grains identified in weld zone and the width of heat affected zone was significantly changes with laser welding power. The mechanical properties of the weld joint are controlled by obtaining optimum weld bead geometry and width of the head affected zone in the welds.

QUALITY RATING OF ASSEMBLY SETS IN DIRECTIONAL SELECTION OF PARTS

2020 ◽  
pp. 48-53
Author(s):  
А. V. Medvedev ◽  
E. M. Khalatov
Keyword(s):  
Directional Selection ◽  
Rating System ◽  
Advantages And Disadvantages ◽  
Quality Rating ◽  
Predicted Values ◽  
Selection Of

The paper considers a problem of quality rating of collection of assembly sets for assembly of production batch. This problem emerges in the course of directional selection of parts in the assembly sets. Advantages and disadvantages of the most widespread systems of quality rating for finished goods with the use of these systems to estimate the quality of collection of the assembly sets was considered. In the course of selection of parts in the assembly sets it was proposed the following: calculate the relative values of serviceability reserve of products from the predicted values of future product performances and take the smallest value from derived values as quality rating of collection of assembly sets. Proposed quality rating system of assembly sets makes possible constructing a fairly easy algorithm for selection of parts in sets for assembling production batch from limited quantity of previously stored parts with known parameters.

Evaluation of Quality of Steering Systems Using the Honing Process and Surface Response Methodology

2011 ◽  
Vol 223 ◽  
pp. 821-825 ◽  
Author(s):  
Sandro Pereira Silva ◽  
Lincoln Cardoso Brandao ◽  
Rafael Flávio Pimenta Pereira
Keyword(s):  
Power Systems ◽  
Cycle Time ◽  
Feed Rate ◽  
Surface Hardness ◽  
High Hardness ◽  
High Strength ◽  
Grinding Wheel ◽  
Surface Response Methodology ◽  
Low Weight

Gears are components indispensable in power systems, gearboxes, and machine tools. Modern gears have preferably high strength, high hardness, wear resistance, and low weight. According to this characteristics, the manufacturing process of gear generally use undefined cutting edge. Nowadays, honing process has been introduced in Brazil into companies that manufacturing steering systems and gearboxes. Honing has great advantages that are the possibility of adjustment of gearing failures and mixed orientation of the manufacturing of grooves approaching to the pitch diameter. This paper shows an analysis of honing process that includes a modeling of accurate, the Brazilian development status, and mainly the optimization using response surface methodology. Tests were carried out in plant using 54 pinions of 4320-H steel with hardness of core of 295 HV2 and surface hardness of 600 HV2. The machine used in tests was a Fässler model HMX-400. The input parameters were spindle speed of pinion, speed of grinding wheel, feed rate, spark out, and cycle time. The results showed that the cycle time and feed rate influenced directly the helix form error and the evolvent profile error. The re-sults showed not only on the decrease of surface roughness but also on that, the geo-metric errors were below the standard DIN 5.

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