Study on Identification and Classification of Causes which Generate Welds Defects

Luca, Liliana; Cîrțînă, Liviu Marius; Stancioiu, Alin

doi:10.4028/www.scientific.net/amm.657.256

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…Ishikawa diagram is an excellent tool for mapping the possible sources of uncertainties [7]. An Ishikawa diagram was developed for residual stress measurements by XRD ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Study of Error Analysis and Sources of Uncertainty in the Measurement of Residual Stresses by the X-Ray Diffraction

Filho

Medeiros

Martinez

et al. 2018

Materials Research Proceedings

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“…Ishikawa diagram is an excellent tool for mapping the possible sources of uncertainties [7]. An Ishikawa diagram was developed for residual stress measurements by XRD ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Study of Error Analysis and Sources of Uncertainty in the Measurement of Residual Stresses by the X-Ray Diffraction

Filho

Medeiros

Martinez

et al. 2018

Materials Research Proceedings

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“…The advantage of using this chart is that it offers the possibility of examining logically and chronologically the objectives and actions that solve a quality or non-quality problem. Non-qualitative issues and case studies that apply the quality management tools (for example, fish bone diagram) are outlined in several papers [1,2,3,4]. The tree chart was used to analyse defects and establish measures to eliminate nonconformities in many areas of activity (industrial and service activities).…”

Section: Introductionmentioning

confidence: 99%

Actions to increase the reliability of the chain transmissions

Ghimişi

Nicula

2018

MATEC Web Conf.

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Correct analysis of a malfunction is a very important step in the remediation process of a product. It is necessary to have a clear vision, especially to determine the cause of the malfunction, although sometimes it can be masked by other defects. Quality Management offers many classic and modern tools to help find solutions that ensure quality improvement. This paper presents a modern method of quality management, called the tree diagram, applied to the issue of increasing the reliability of the chain transmissions. The advantage of using this chart is that it offers the possibility of logically and chronologically examining the objectives and actions that solve a quality or non-quality problem. In the proposed case study, the overall objective is to increase the reliability of the chain transmissions. Specific objectives are set and for each specific objective, we identify potential solutions that can be adopted. For the proposed general objective, the following three specific objectives have been identified: Reduction of chain wheel wear and chain joints, Ensuring proper fitting, Adoption of optimal chain tensioning solutions. On the basis of the presented measures, the tree diagram was made on three levels. The tree chart made outlines the relationship between the overall goal pursued and the actions taken to achieve them. This tool can be used in planning and solving quality assurance problems in the case of the chain transmissions.

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“…Research has shown that the propagation of ultrasound in the liquid metal bath has considerable influences on the process of transferring the material through the electric arc and on the crystallization process. All these influences are attributed to basic phenomena due to the propagation of ultrasounds in liquid media, namely ultra acoustic cavitation and accelerating the diffusion process [ 9 , 10 , 11 ]. It is also very important to analyze the longitudinal vibration theory for a bar with a variable transverse section, so as to obtain a greater amplification of the efficiency of ultrasonic vibrations [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Use of Ultrasound in Reconditioning by Welding of Tools Used in the Process of Regenerating Rubber

Dobrotă

Petrescu

2018

Materials

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Addressing the problem of reconditioning large parts is of particular importance, due to their value and to the fact that the technologies for their reconditioning are very complex. The tools used to refine regenerated rubber which measure 660 mm in diameter and 2130 mm in length suffer from a rather fast dimensional wear. Within this research, the authors looked for a welding reconditioning procedure that would allow a very good adhesion between the deposited material layer and the base material. In this regard, the MAG (Metal Active Gas) welding process was used, but the ultrasonic activation of the welding process was also considered. Thus, the wire used for welding was activated considering a variation of the frequency of ultrasounds in the range f = 18–22 kHz respectively of the oscillation amplitude A = 30–60 μm. Under these conditions it was found that the presence of ultrasonic waves during the welding cladding process results in uniform deposition of hard carbons at the grain boundary and in the elimination of any existing oxides on the deposition surface, but at the same time increases the adhesion between the base material and the additional material, all of which positively influence the wear and corrosion resistance of the tools used to refine the regenerated rubber.

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Study on Identification and Classification of Causes which Generate Welds Defects

Cited by 7 publications

References 4 publications

Study of Error Analysis and Sources of Uncertainty in the Measurement of Residual Stresses by the X-Ray Diffraction

Study of Error Analysis and Sources of Uncertainty in the Measurement of Residual Stresses by the X-Ray Diffraction

Actions to increase the reliability of the chain transmissions

Use of Ultrasound in Reconditioning by Welding of Tools Used in the Process of Regenerating Rubber

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