SVIBOR - Project code: 2-08-168

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

SVIBOR

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Project code: 2-08-168


WELDING AND QUALITY ASSURANCE


Main researcher: KRSTELJ, VJERA (24006)


Assistants
Type of research: applied
Duration from: 01/01/91. to 12/31/94.
Papers on project (total): 63
Institution name: Fakultet strojarsva i brodogradnje, Zagreb (120)
Department/Institute: Department of Technology
Address: Đure Salaja 1
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)41 512 014
Phone: 385 (0)41 519 822
Fax: 385 (0)41 519 822
E-mail: VJERA.KRSTELJ@X400.SRCE.HR
Summary: Nondestructive testing is not used extensively enough in a system of the quality assurance as it should, considering the possibility of detection of flaws and assessment of their parameters, and nondestructive diagnostics of existing condition and level of quality of the tested object. Beside not being used enough, nondestructive testing is often used in inadequate way, due to insufficient knowledge of affecting factors and their effects in the system "testing method- tested object". Within this project, particular attentions has been paid to change from qualitative results of testing to quantitative results. The best advance in this direction has been made in investigation of possible application and reliability of ultrasonic control. A number of papers resulting from the work on the project justifies the undertaken research, particularly as the ultrasonic testing has a wide field of application in the croatian industry. Possibility of automation, and results achieved at wet underwater welding indicate possible applications in shipbuilding, offshore testing and welding. Simultaneously with investigation of reliability of testing methods, problems at welding and welded joints characteristics has been analyzed. Also, acceptance and limitations of particular materials regarding the quality requirements has been studied. Particularly, relationship between results and quality assurance of a product should be pointed out, as well as new approaches to assessment and necessity to establish the quality assurance system which should take care of the product from the design stage to the service and final scrapping. This is one of the priorities required for the survival in the market, and preserved surrounding. Considering the ecology aspects, papers are directed to the preventive ecology, ie. quality assurance that will comprise ecology approach.

Keywords: quality assurance, nondestructive testing, nondestructive measurements, ultrasonics, welding, ecology, maintenance, education, sensitivity, reliability, application, normization

Research goals: The goal of the research has been manifolded: first, to find out relationships in a extremely complex process of material joining, to provide optimum quality of a welded structures, and second, research of possible applications, sensitivity and reliability of testing methods used to detect defects and degradation of structure generated either in the manufacturing process or in the service. Connecting both researches, ie. research in joining of materials and quality control, reduction of experimental work may be achieved, because certain number of samples can be used in both projects. Most important contribution yielding from this project is improvement of nondestructive testing methods, aimed to raise quality of welded structures, revitalize and rationalize production and maintenance. In this way, results are closely related to the preventive ecology. As the contributions of the research, development and application of new filler materials used for hard surfacing and better understanding of effects of cracks upon the wear resistance in dynamic and static conditions, possibilities of use of high alloyed steel and extending of service life of a products made of such steel by welding may be listed. Also, results of research are providing an improvement of education in the field of quality assurance, nondestructive testing, ecology and welding technology.
Other information about the project.
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