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Quality Testing and Standard of Copper and Steel Re-melt Welding

Author: ZuoMeiLi
Tutor: WangKeHong；XuYueLan
School: Nanjing University of Technology and Engineering
Course: Materials Processing Engineering
Keywords: Copper and steel melting welding Adaptive Quality testing Standard Specification
CLC: TG441.7
Type: Master's thesis
Year: 2009
Downloads: 75
Quote: 0
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Abstract


This paper analyzes the deposited welding process characteristics , deposited on copper and steel welding defects classification of welding defect generation mechanism , Experimental study on the relationship between the welding process conditions and the quality of the joint , draw the most likely to produce welding defects technical conditions and design of the welding procedure test , pores , slag , not welded typical defects sample . Analysis of the causes of the digital ultrasound system pulsating noise , raised ground , servo motor shield and device reset method to solve the problem of low noise , and signal-to-noise ratio ; taking into account the high - speed production conditions , the the workpiece mounted central bank can not be completely in highly adaptive adjustment probe design ideas , bead height tracking principle , the development of the probe adaptive devices , to solve the probe and the workpiece is not constant technical difficulties . Ultrasonic C- scan the deposited copper steel welding defect detection process parameters were analyzed and found to have a greater impact , pulse width and repetition frequency of the defect wave through repeated trials , the optimal range of parameters ; single crystal the straight probe immersion probes study of comparative tests , select a frequency of 10MHz immersion probes , detection effect is relatively ideal , based on the detection time and detection quality requirements , the the workpiece rotary servo motor speed is 120 ° / s . Analysis of the copper and steel deposited welding head hosted condition , deposited detection methods and parameters of the quality of the welding head system , including appearance , mechanical properties of the joints , as well as copper and steel connector body internal defects detection . Penetrant inspection detect the pipe surface defects , Shear strength test method , the test connector bond strength ; microstructure analysis method detection connector microscopic defects , organization and composition , internal defects ray and ultrasonic testing method for testing of welded joints , the establishment of deposited copper steel welding head preliminary quality inspection standard system .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > General approach > Welding defects and quality inspection
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