Electronics Forum | Thu Aug 06 09:51:20 EDT 1998 | Bob Willis
This text may be of interest to any one with tin lead spots Guide to Solder Spots - A New Plague in Manufacture ? So what are solder spots ? They appear to be the next big problem in modern reflow assembly in fact in any process that involves solder
Electronics Forum | Thu Mar 30 13:53:53 EST 2006 | PWH
We've had poor luck with leaders - inefficient, not cost effective for the price of the parts usually. In my opinion, your best bet is to over-issue parts to a scrap # that works for you (all feeders are different as are machine scrap rates). This
Industry News | 2015-03-02 11:42:19.0
The SMTA is pleased to announce the program for the 9th Annual International Conference on Soldering and Reliability being held May 19-21, 2015 in Markham, Ontario, Canada. The event will be co-located with the SMTA Toronto Expo.
Industry News | 2018-10-18 09:37:27.0
How To Set Profile In SMT Reflow Oven
Technical Library | 2023-01-17 17:27:13.0
Reflow profile has significant impact on solder joint performance because it influences wetting and microstructure of the solder joint. The degree of wetting, the microstructure (in particular the intermetallic layer), and the inherent strength of the solder all factor into the reliability of the solder joint. This paper presents experimental results on the effect of reflow profile on both 63%Sn 37%Pb (SnPb) and 96.5%Sn 3.0%Ag 0.5%Cu (SAC 305) solder joint shear force. Specifically, the effect of the reflow peak temperature and time above solder liquidus temperature are studied. Nine reflow profiles for SAC 305 and nine reflow profiles for SnPb have been developed with three levels of peak temperature (230 o C, 240 o C, and 250 o C for SAC 305; and 195 o C, 205 o C, and 215 o C for SnPb) and three levels of time above solder liquidus temperature (30 sec., 60 sec., and 90 sec.). The shear force data of four different sizes of chip resistors (1206, 0805, 0603, and 0402) are compared across the different profiles. The shear force of the resistors is measured at time 0 (right after assembly). The fracture surfaces have been studied using a scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS)
Technical Library | 2020-10-27 02:02:17.0
Solder powder size is a popular topic in the electronics industry due to the continuing trend of miniaturization of electronics. The question commonly asked is "when should we switch from Type 3 to a smaller solder powder?" Solder powder size is usually chosen based on the printing requirements for the solder paste. It is common practice to use IPC Type 4 or 5 solder powders for stencil designs that include area ratios below the recommended IPC limit of 0.66. The effects of solder powder size on printability of solder paste have been well documented. The size of the solder powder affects the performance of the solder paste in other ways. Shelf life, stencil life, reflow performance, voiding behavior, and reactivity / stability are all affected by solder powder size. Testing was conducted to measure each of these solder paste performance attributes for IPC Type 3, Type 4, Type 5 and Type 6 SAC305 solder powders in both water soluble and no clean solder pastes. The performance data for each size of solder powder in each solder paste flux was quantified and summarized. Guidance for choosing the optimal size of solder powder is given based on the results of this study.
https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_conveyor/100.html PCB linking conveyor and PCB belt conveyor mainly used to connect different type PCB board handing equipment effectively for the SMT production line. ASCEN technology is ava
https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_conveyor/100.html PCB linking conveyor and PCB belt conveyor mainly used to connect different type PCB board handing equipment effectively for the SMT production line. ASCEN technology is ava
SMTnet Express, February 13, 2020, Subscribers: 34,017, Companies: 10,974, Users: 25,597 Size Matters - The Effects of Solder Powder Size on Solder Paste Performance Credits: FCT ASSEMBLY, INC. Solder powder size is a popular topic
SMTnet Express, April 13, 2017, Subscribers: 30,391, Companies: 10,572, Users: 23,128 A Study to Determine the Impact of Solder Powder Mesh Size and Stencil Technology Advancement on Deposition Volume when Printing Solder Paste Karl Seelig, Tim O
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2018/07/pan_APEX06.pdf
while there is no significant difference on shear force between the peak temperature of 195C and 205C. Table 4. ANOVA for the Square Root of the SAC305 Shear Force Source Sum of Squares Df Mean Square F-Ratio P-Value Main Effects A: Component Size
Surface Mount Technology Association (SMTA) | https://www.smta.org/icsr/speaker_forms/Paper-Format-Requirements.doc
, JEITA and within the European Union. A recent shift towards SAC305 has recently been observed within the industry due to its lower cost when compared to SAC405, based on lower silver content
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