MARC details
| 000 -LEADER |
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| fixed length control field |
04797ntm a2200253 a 4500 |
| 001 - CONTROL NUMBER |
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| control field |
vtls000091316 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
KUKTEM |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20251117113308.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
150923t2015 my da f abm 000 0 eng d |
| 020 ## - INTERNATIONAL STANDARD BOOK NUMBER |
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| International Standard Book Number |
THE0006826(Local) |
| 039 #9 - LEVEL OF BIBLIOGRAPHIC CONTROL AND CODING DETAIL [OBSOLETE] |
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| Level of rules in bibliographic description |
201905291246 |
| Level of effort used to assign nonsubject heading access points |
amirul |
| Level of effort used to assign subject headings |
201808171034 |
| Level of effort used to assign classification |
saini |
| Level of effort used to assign subject headings |
201509231125 |
| Level of effort used to assign classification |
asma |
| -- |
201509231124 |
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asma |
| 040 ## - CATALOGING SOURCE |
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| Original cataloging agency |
UMP |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
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| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
TK4660 .I85 2015 r Thesis |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Islam, Md. Rafiqul |
| 245 13 - TITLE STATEMENT |
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| Title |
An experimental study and modeling on gas metal arc welded lap joint of A7075-T651 aluminium alloy to AZ31B magnesium alloy / |
| Statement of responsibility, etc. |
Md. Rafiqul Islam |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. |
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| Place of publication, distribution, etc. |
Kuantan, Pahang : |
| Name of publisher, distributor, etc. |
UMP, |
| Date of publication, distribution, etc. |
2015 |
| 300 ## - PHYSICAL DESCRIPTION |
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| Extent |
xix, 113 p. : |
| Other physical details |
ill. (some col.) ; |
| Dimensions |
30 cm. + |
| Accompanying material |
3 CD-ROM |
| 500 ## - GENERAL NOTE |
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| General note |
Faculty of Mechanical Engineering |
| 502 ## - DISSERTATION NOTE |
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| Dissertation note |
Thesis (Master of Engineering (Mechanical)) -- Universiti Malaysia Pahang – 2015 |
| 504 ## - BIBLIOGRAPHY, ETC. NOTE |
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| Bibliography, etc. note |
Bibliography : p. 102-112 |
| 520 3# - SUMMARY, ETC. |
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| Summary, etc. |
Innovative welding technique for joining aluminum and magnesium alloys in automobile, aviation, aerospace and marine industries would achieve weight reduction, high specific strength as well as increase fuel efficiency and reduce environmental pollution. However, poor mechanical properties of welding joint between aluminum and magnesium alloys due to the formation of AlmMgn type brittle intermetallic compounds is the main barrier for extensive uses of these two alloys especially in transportation sectors. No exact solution has been established yet for reliable joining while; modeling study in this area is still much lagging. This research work was carried out to conduct experimental study and mathematical modeling of mechanical properties for A7075- T651 aluminum and AZ31B magnesium alloys joints welded by gas metal arc lap welding method. Unconventional ER308L-Si stainless steel and conventional ER5356 aluminum wires were used as filler. Shielding gas used was 98% argon and 2% oxygen. The shielding gas flow rate, tip to work distance, welding current and voltage were the variable parameters. Box-Behnken technique in response surface methodology was used for design of experiments. The welding torch angle, filler wire diameter and parent metal thickness were kept constant. The ultimate tensile strength and fracture toughness of the joints were evaluated. The fracture toughness of the welding joints was calculated from yield strength and absorbed charpy impact energy of the joints using Rolfe-Novak-Barsom correlation. Mathematical models were developed based on regression analysis to relate the responses (ultimate tensile strength and fracture toughness) with welding variable parameters and validation experiments were conducted to verify the models. The significance and effects of variable parameters on the responses were also analyzed. The macro and microstructures at the welding cross section were investigated by optical microscope. The fracture surface morphologies and elements analysis at the welding cross section were carried out by scanning electron microscopy and electron dispersive X-ray spectroscopy. The results revealed that more significant mechanical properties were achieved with stainless steel filler compared to aluminum filler. The maximum yield strength, ultimate tensile strength and fracture toughness were 203.09 MPa, 249.33 MPa and 27.49 MPa√m respectively with steel filler; and 176.30 MPa, 226.28 MPa and 20.22 MPa√m respectively with aluminum filler. The analysis of variance showed that a very good fitting and variation with data, high accuracy in predicting the responses have been illustrated by the models for both fillers. The validation tests revealed that the ultimate tensile strength models can predict the responses within 0.21% and 1.81% maximum error, and fracture toughness models can predict the responses within 0.51% and 3.36% maximum error respectively. Most of the joints failed at AZ31B alloy (with steel filler) and ER5356 aluminum nugget (with aluminum filler). The investigation revealed that fracture occurred due to brittle fracture mechanism by formation of micro pores, voids, cracks, MgnOm oxides, very little amount of MgnFem and AlmMgn intermetallic compounds at AZ31B alloy, and due to micro pores, voids, cracks, AlmOn and MgmOn oxides and a good amount of AlmMgn intermetallic compounds at aluminum nugget. There was no evidence of fracture from metallurgical bonding between steel or aluminum nuggets and parent alloy. The output of this research exhibited very significant mechanical properties of the joint that can facilitate the extensive uses of A7075-T651 and AZ31B alloys in mass production of light weight vehicle structures in transportation industries |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Gas metal arc welding |