Effect of Process Parameters on Free Air Ball Integrity in Copper and Palladium-Coated Copper Bonding Wires

2015 ◽  
Vol 12 (2) ◽  
pp. 98-103
Author(s):  
Noritoshi Araki ◽  
Yasutomo Ichiyama ◽  
Ryo Oishi ◽  
Teruo Haibara ◽  
Takashi Yamada
Keyword(s):  
Process Parameters ◽  
Formation Process ◽  
High Speed ◽  
High Speed Camera ◽  
Formation Processes ◽  
Shielding Gas ◽  
Optimization Of Process Parameters ◽  
Free Air ◽  
Bonding Wires ◽  
High Density Packaging

The free air ball (FAB) formation processes of fine diameter Cu wires were observed, and the effects of process parameters were studied on the basis of high-speed camera observation. It was revealed that the FAB formation process is characterized by preheating before melting, melting that accompanies ball rising, and solidification periods. The relationships between the electronic flame-off (EFO) condition and the FAB formation were summarized for both bare Cu and palladium-coated Cu (PCC) wires. Further study was performed on the changes in FAB shape with different EFO conditions, wire types, and FAB sizes. Off-centered FABs were observed in the bare Cu wire whereas they were rarely observed in the PCC wire. The off-center tended to be affected by shielding gas condition, EFO torch gap, and FAB size. The mechanisms of the off-centered FAB formation were proposed through the high-speed camera observations. The optimization of process parameters to achieve defect-free, consistent FAB is discussed based on these findings, which is useful for the next generation high-density packaging.

Effect of Process Parameters on Free Air Ball Integrity in Copper and Palladium-coated Copper Bonding Wires

2014 ◽  
Vol 2014 (1) ◽  
pp. 000272-000277
Author(s):  
Noritoshi Araki ◽  
Yasutomo Ichiyama ◽  
Ryo Oishi ◽  
Teruo Haibara ◽  
Takashi Yamada
Keyword(s):  
Process Parameters ◽  
Formation Process ◽  
High Speed ◽  
High Speed Camera ◽  
Formation Processes ◽  
Shielding Gas ◽  
Optimization Of Process Parameters ◽  
Free Air ◽  
Bonding Wires ◽  
High Density Packaging

The Free Air Ball (FAB) formation processes of fine diameter Cu wires were observed, and the effects of process parameters were studied on the basis of high-speed camera observation. It was revealed that the FAB formation process is characterized by preheating before melting, melting that accompanies ball rising, and solidification periods. The relationships between the electronic flame-off (EFO) condition and the FAB formation were summarized for both bare Cu and palladium-coated Cu wires. Further study was performed on the changes in FAB shape with different EFO conditions, wire types, and FAB sizes. Off-centered FABs were observed in the bare Cu wire whereas they were rarely observed in the Pd-coated Cu wire. The off-center tended to be affected by shielding gas condition, EFO torch gap, and FAB size. The mechanisms of the off-centered FAB formation were proposed through the high speed camera observations. The optimization of process parameters to achieve defect-free, consistent FAB is discussed based on these findings, which is useful for the next generation high density packaging.

Influences of End Surface Angle of Workpiece on Burr Formation in High Speed Machining

2009 ◽  
Vol 69-70 ◽  
pp. 384-388
Author(s):  
Qin Xi Shen ◽  
Gui Cheng Wang ◽  
Hai Jun Qu ◽  
Yun Ming Zhu
Keyword(s):  
Aluminum Alloy ◽  
Formation Process ◽  
High Speed ◽  
Shear Angle ◽  
Burr Formation ◽  
High Speed Machining ◽  
Formation Processes ◽  
Key Factors ◽  
2024 Aluminum Alloy ◽  
Surface Angle

The end surface angle of workpece is one of key factors that affect burr sizes and shapes. In this paper, the burr formation process of different end surface angle is simulated with elastic plastic nonlinear element method based on ABAQUS. The influence of end surface angle of workpiece on burr formation processes in high-speed machining 2024 Aluminum alloy is analyzed. The influence of end surface angle on burr sizes and shapes is studied based on equivalent shear strain and negative shear angle. The results have investigated the mechanisms of burr formation fundamentally, which is the basis of burr minimization.

scholarly journals Influence of Gravity on Molten Pool Behavior and Analysis of Microstructure on Various Welding Positions in Pulsed Gas Metal Arc Welding

2019 ◽  
Vol 9 (21) ◽  
pp. 4626 ◽  
Author(s):  
Jin-Hyeong Park ◽  
Sung-Hwan Kim ◽  
Hyeong-Soon Moon ◽  
Myung-Hyun Kim
Keyword(s):  
Weld Metal ◽  
Arc Welding ◽  
Molten Pool ◽  
High Speed ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
High Speed Camera ◽  
Shielding Gas ◽  
Metal Arc Welding ◽  
The One

This study performed welding on various welding positions in the flat, overhead, and vertical down positions using a pulsed gas metal arc welding (P-GMAW) process. Despite the same amount of heat input on various welding positions, the welding characteristics varied depending on the welding positions. The effect of gravity on the welding process determined the different formation of the weld bead, and the influence of molten pool behavior on various welding positions changed the microstructure in the weld metal. The current and voltage signals were synchronized with a high-speed camera using a data acquisition (DAQ) system. To induce the one pulse one drop (OPOD) process of metal transfer, the shielding gas was used 95% Ar+5% CO2. The microstructure of the weld metal was analyzed in relation to molten pool behavior.

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