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008			230720t20232023my a|||fr|||| 000 0 eng d
020			_aTHE0009672 (Local) _qHardback
040			_aUMP _beng _cUMP _erda
090			_aFTKMA .Y87 2023 r Thesis
100	1		_aYus Erny Amirah Mohd Yusof, _eauthor.
245	1	0	_aEffect Of Laser Power On Temperature Evolution, Brazing Phases And Mechanical Properties Of Cu/cu Brazed Joint / _cYus Erny Amirah Mohd Yusof
264		1	_aKuantan, Pahang : _bUMP, _c2023
264		4	_c©2023
300			_axiii, 69 pages : _billustrations _c30 cm. + _e1 CD-ROM
336			_2rdacontent _atext
336			_2rdacontent _atext
337			_2rdamedia _aunmediated
337			_2rdamedia _acomputer
338			_2rdacarrier _avolume
338			_2rdacarrier _acomputer disc
347			_2rda _atext file _bPDF
500			_aFaculty of Mechanical and Automotive Engineering Technology
502			_aThesis (Master of Science) -- Universiti Malaysia Pahang – 2023
504			_aIncludes bibliographical references
520	3		_aBrazing technique via heat source has been employed in joining the pure copper. Brazing parameters and laser power are crucial factors in determining the joint quality during indirect laser brazing. This research investigated the effects of laser power on brazing temperature, temperature evolution, brazing phases, the strength of the joints, filler spreadability and surface fracture on copper alloys. The brazing process was carried out in a vacuum chamber with a constant vacuum pressure of 400 Pa over 66 seconds for each sample to ensure that the filler metals were melted completely. Cu-78.3Ni-9.9Sn-4.0P-7.9 (MBF2002) was used as a filler metal to braze the Cu/ Cu joints. When the laser power varied from 30 W to 50 W, the brazing temperature increased gradually, hence creating a temperature profile where the brazing phases were identified. With increasing the laser power, the tensile shear strength of the joint also increased. The maximum value of shear strength (159.27 MPa) was obtained at 50 W of laser power compared with another laser power. The shear strength increased by 34.02%. The fracture surfaces were examined under an optical microscope and 3D measuring laser microscope to observe the filler spreadability and surface roughness. It showed that the roughness increases as the laser power increases. The fracture surface occurred at the filler metal and characterized by brittle fracture. In addition, the EDX was carried out for the 50 W laser power sample to identify the microstructure and phase composition of joint interfacial. The microstructure consisted of Cu (Sn- rich) and a Cu-Ni-P phase formed at the brazed joint. Based on the results, the actual process that occurs behind the laser brazing are known through the brazing phases involved.
610	2	0	_aFaculty of Mechanical and Automotive Engineering Technology _xDissertations
650		0	_aUniversities and colleges _xDissertations
650		0	_aTheses
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