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 Aug 30, 2010 |
Voiding in LGA (LT) soldering We having issues installing the Linear Tech LTM8023. We have different soldering results in our PBfree testruns. The voiding and solderball rate is not stable (random positions and sizes). The pcb's (gold finish)are prebaked, the LGA's are stored in Drycabinets etc. We tried already different value's of the following parameters: Stencil thickness, Stencil apperture, stencil reduction, different PCB manufacturers, P&P pressure and reflowprofile. The only item we have ...
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Aug 30, 2010 |
Multiple Resistor Rework Lots of small parts, lots of hand soldering, lots of tired eyes inspecting on lots of boards: yields lots of room for error. How about this: * Part removal ** Cut each resistor between the pads using dykes ** Using a soldering iron [or hot air pen], melt the solder at each connection and flick the half component from the board with the iron [or tweezers] [Remember this is really tedious, shit-work. So maybe assemble a multi-person flow line to crush this part of the ...
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Aug 29, 2010 |
Kemet Ceramic Capacitor We know nothing about your process, but Kemet ceramic capacitors can be wave soldered. Kemet wrote papers on wave soldering their parts ...
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Aug 10, 2010 |
Board warpage after wave soldering No, warpage tells you that design and/or fabrication process and/or assembly process need[s] to be corrected. Here's a link to a recent thread on SMTnet that seems to answer some of your questions: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=62267 A-600 describes acceptable limits to warp and twist ...
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Aug 5, 2010 |
Corrosion associated with degreaers Corrosion of soldering equipment!!! That would be the least of our concerns. Propyl Bromide has a flash point of 21*C [70*F]. It's not real stable. It's flammable. It's ready to go at room temperature. Have someone else operate those machines and get yourself assigned to work in a different area of the building ...
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Jul 6, 2010 |
PCB bows after wave soldering Hello Sid: i don't know where you bought the machine. the central support system is an addition part, it is specially designed to prevent the PCB board from bowing. i know that the wave soldering machine which made before did not include this useful system. but now it is used commonly. you may consult your supplier about the new addition. they may explain you very well about this problem. because i am a manufacturer of wave soldering machine, if our customers ...
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Jun 24, 2010 |
PCB bows after wave soldering Our best suggestion - get the copper balanced and if possible go to higher Tg materials ...
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Jun 14, 2010 |
SnPb Wave Soldering with SN100C HASL I have CCA that has a SN100C HASL coating that I am wave soldering with SbPb. I have mounting pad areas on the CCA that are masked with a pallet during reflow so they are not exposed to the solder. The mounting pads are turning gray in some areas of the pad where the HASL coating appears to be thinner than others. It has a similar appearance to dewetting. Has anyone else experienced this ...
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May 25, 2010 |
Help with dewetting Where on the assembly is the dewetting occurring? Factors that influence dewetting usually involve non-ionic contamination such as: * Residues from board manufacture including silicone surfactants from solder resist & HASL rinse contamination * Component residues like mold release agents * Silicone oil from adhesives in production. * Soldering process residues * Cleaning bath contamination where rinsing has failed * Operator handling that adds contaminants
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May 18, 2010 |
sockets soldering OK. So, why do you have to heat it to 250*C to get it melt? What is the solderability protection on: * Board * Socket
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May 13, 2010 |
sockets soldering Jacki: That's exactly what we need to know, so that we can start slogging through this. [See we don't do well with broad, generalized questions. We don't have time to write dissertations. This is a task-oriented group.] Let's focus further: * Is the failed item multiple or a single part number? * Is the failed item from a single lot or from various lots? * Is the failed item from a single manufacturer or from various sources? * How often does this occur [ie, different ...
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May 3, 2010 |
Vapor soldering Does this mean u have to manualy put, the board's coming out of the placer, into the 'oven ...
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May 2, 2010 |
Degolding Pretinning J-STD-001 is your base requirement, but MIL and SPACE have stringent requirements for soldering gold plated terminals, e.g. this typical one: http://xweb.nrl.navy.mil/glast/CALDesign/CDE/CAL%20DPD%20Wire%20Cable%20Soldering%20and%20Staking%20Spec%20Rev%202.doc
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Apr 26, 2010 |
To reduce the dross formation in wave soldering process Set pump speed so that the board is 1/3 to 1/2 immersed as it goes through the wave ...
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Apr 22, 2010 |
To reduce the dross formation in wave soldering process Ralph Woodgate is the 'god of wave soldering process control.' We believe he is now retired, but in olden times his presentations at SMTA meetings were 'DO NOT MISS.' We imagine you can find his books on the used book market. Look here: http://users.rcn.com/woudyet/author.htm
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Apr 19, 2010 |
To reduce the dross formation in wave soldering process Ralph Woodgate says that pump speed is the biggest driver to dross production
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Apr 15, 2010 |
To reduce the dross formation in wave soldering process Dross formation rates for SnCu and SAC are roughly 2.5 times the rate for SnPb (Hwang et al., 2004) Methods for reducing dross are: * Lower pot temperature * Run pump speed slower and only when soldering * Check solder contaminants to BS219, ASTM B32-66T * Use nitrogen tenting * Buy only low dross cast bar
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Apr 5, 2010 |
... are installing via reflow soldering a crystal that has 2 pads, 1 each end. They are flat pads on the bottom of the part with a small area of the pad looping around and up the side of the crystal on the end. Inspection of the cyrstal under a 40X microscope after reflow show a good solder joint with a proper fillet on the end where the pad is exposed. However, our EMS customer says a few do not work until they reflow the joints on both ends of the crystal with a soldering iron tip. Does anyone ...
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Apr 4, 2010 |
Solder briding on QFP On the Xilinx chips, I am pretty sure these hairs are NOT tin whiskers. The solder in this particular build was SnPb, and pure tin would almost certainly melt at soldering iron temperatures. My theory is that slivers of the lead frame material, likely copper with some plating, is being left after the lead frame is punched out, and is encapsulated in the solder plating. When I reflow the part on the board, these slivers are released and move around. But, that is just a ...
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Mar 26, 2010 |
... an issue. A dry cabinet at @1% humidity will keep your BGAs dry and even the Totech ones will remove moisture from them, thus resetting the floor life. You'll never need to bake another BGA again. But as this is a tin/lead BGA then even repeat baking isn't such an issue as it is with lead free BGAs. What peak temperature are you getting the BGA to when soldering it ? As the BGA is big and has a heat sink I think concentrating on getting a good thermal profile will be important. Good luck ...
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Mar 26, 2010 |
... dry packs or dry cabinets or bake them once just before they are assembled. Follow IPC JEDEC 33 for storage / baking recommendations. Repeat baking will cause the solder spheres on the BGA to become very heavily oxidised and you'll probably get soldering problems and solder defects. This could be the root cause of your issues. Are you baking the devices at the correct temperature/time as specified on the moisture barrier bag or in IPC JEDEC 33 ? What moisture sensitivity level is the device..(I ...
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Mar 19, 2010 |
Material for Wave Soldering Jigs/Carriers Please, can anyone suggest a good material for wave solder jigs or carriers? Been using Durapol but this material is quite expensive. Any alternative?
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Mar 18, 2010 |
Fisnar I&J500 Selective soldering robot repair. Hi, I have a Fisnar I&J500 Selective soldering robot that has failed. I think it is from around 2000. The Fisnar I&J500 base has a soldering attachment on it. As I understand it, the base controller sends it a 5 bit command to the soldering unit. The 5 bit code selects 1 of 32 pre-programmed soldering block operations. From the timing diagrams in the manuals I have, it then waits for the soldering unit to send back an ack when done. My guess is ...
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Mar 16, 2010 |
Solder Graping - What's this? What is solder graping and how do they look like? What are the possible causes of solder graping during reflow soldering? kind regards ...
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Mar 11, 2010 |
... pattern, the line will shift back and forth 1/8". Even with the nozzle not moving, you can see the spray pattern dance or shift around. By the way it is not me that can not get it to work, the ACE trainer is at my site starting for the 12th day. He was here 8 days with the 101A, and starting his 4th day with the 102. Today we got in Alpha EF-2210 flux to see if that makes a difference. This is my first piece of soldering equipment, so everything like the chemicals, and nitrogen are brand new ...
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Mar 9, 2010 |
Pin hole We have encountered high percentage of pin holes issue after lead-free reflow soldering from particular diode supplier that manufactured at Morocco. However, very little reject being found if the particular component is manufactured at China by using the identical process, machines and chemicals. We did highlighted to the particular supplier but they did not admitted that any changes/differences from these two plants. Please advise if any comments/recommendations for us to pursue these ...
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Mar 5, 2010 |
Socket in wave soldering Just got this off the wire, new IPC A610E Document -due out in April: http://www.solder.net/marketplace/product_desc.asp?Sku=IPC-A-610E&Category=61
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Mar 1, 2010 |
Socket in wave soldering Your IPC-610 workmanship manual will have the answer for you (I don't have the latest at my fingertips). Depends on what class you are building too, 1, 2 or 3 and the application of this connector on the product- which you must determine ...
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Feb 28, 2010 |
Socket in wave soldering Dear all There are alot sockets in our products,BIB.These skts are lifted abit after being solderd with wave machine.If the skts become lifted, how much tolerance of the high is acceptable? as example 1mil~5mil,or,1mil~8mil. Pls advise me. Thanks in advance ...
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Feb 18, 2010 |
Toyota sticking pedals recall is a smokescreen Growing tin and other dangerous whiskers: http://www.electroiq.com/index/display/smt-article-display.articles.smt.surface-mount_technology.soldering.solder-and_flux.2010.february-2010.growing-tin_and_other.html
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Feb 16, 2010 |
Lead Free PCB Plating and Leaded Solder Process I predict you will have no problems with your soldering. Remember that all plating is only a few microns thick and quickly washed away by the molten solder. We have used white tin, immersion gold, OSG, etc. for quite a while with leaded solder and always made successful joints ...
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Feb 16, 2010 |
Lead Free PCB Plating and Leaded Solder Process Hi, I have specified Lead Free Plating for my Four Layer PCB. but the Final Production Solder Process is not Lead free it is leaded Process. My question is will there be an issue if we use Lead free plating on PCB and use leaded solder material for soldering ? Thanks
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Feb 10, 2010 |
... using selectively plated gold 25 micro inches in combo SMT/COB gold ball bonded product. Gold cost has increased over the years. Palladium cost is much lower than gold. At least now it is. Cost is about 30% less than that of thick wirebondable gold because ENEPIG uses thinner gold and plating process is easier. In addition, ENEPIG does not cause gold embrittlement in SMT soldering. Anyway, I have tested it and ENEPIG appears to work great. Anyone using it and anyone have any problems with it ...
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Feb 8, 2010 |
detecting BGA micro cracks Woody: Consider using test BGA with no chip in, but daisy chains that you can monitor. After soldering, run environmental tests and follow with electrical tests to determine if the product concept is good enough ...
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Feb 2, 2010 |
Wave Soldering Crystals I just realized that I should've been more specific. (My question was certainly open ended) I'm concerned with Wave Soldering a Metal Body, Two-Leaded Crystal Oscillator such as this: http://www.citizencrystal.com/images/pdf/m-hcm49.pdf Any thoughts?
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Feb 2, 2010 |
Wave Soldering Crystals Just a quick question. Is anybody currently Wave Soldering Crystals on the Bottomside of a PCB? I've always thought that this is taboo. Am I wrong?
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Jan 29, 2010 |
intermetallic movies In response: * We know of no "videos about Pb-Cu intermetallic." Intermetallics are usually observed in microsections of solder connections. * We are unaware of "Pb-Cu intermetallic." In most soldering results in a copper-tin intermetallic. * Training for industry sanctioned repair standards are here: http://www.ipc.org/ContentPage.aspx?pageid=IPC-7711-IPC-7721 * Some of ...
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Jan 29, 2010 |
Automated soldering station (pros and cons) Smtnet, I am looking at pros and cons for automated soldering. The application is a simple multi pin through-hole soldering on a high volume manual assembly line. The goal was to eliminate defects associated with missing solder pins which goes undetected at test. How reliable and repeatable are these benchtop soldering stations? Any feedback/experience is appreciated. Thanks ...
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Jan 29, 2010 |
Automated solder wire feeder hi peter, i have experience with manual soldering iron using automated wire feed,please email to me about it in detail,thank you.email:steven@ludeecircuits.com
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Jan 28, 2010 |
socket PTH reflow soldering i agree, with the other fellow, check the data sheet for the part and see what it can handle otherwise hand assemble ...
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Jan 25, 2010 |
Sockets Soldering with reflow process Dear all I hope someone could have very useful idea for sockets soldered by machine either Reflow or Vapor.And, kindly advise me. Thanks in advance.
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Jan 25, 2010 |
socket PTH reflow soldering Thanks Davf that socket we couldn't change since the customers supply these sockets.we can contro only our process ...
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Jan 22, 2010 |
socket PTH reflow soldering This socket supplier never expected you to do what you're doing to his/her part. Some materials bear-up under the thermal strain of reflow solder than others. Try different socket materials ...
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Jan 21, 2010 |
socket PTH reflow soldering I have tried to solder sockets by reflow machine. but, failed because sockets were deformed after reflow.Has anyone had some advise for me ...
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Jan 19, 2010 |
Soldering iron calibration Approaches are: * Thermal profiler that you use to calibrate your oven. * Any chromel-alumel [Type K] fine wire thermocouple with a cheapo instrument attached will do the job
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Jan 19, 2010 |
Soldering iron calibration does anyone know of a simple way to calibrate sodering irons, without having to purchase those expensive calibration modules?
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Jan 14, 2010 |
Automated solder wire feeder JBC Tools has a wire solder feed solder iron. You can control how much is dispensed to the tip. I have sold several of these to customers soldering wires in to terminals. The hand piece is bigger than the typical solder iron but it beats the alternative. I rep in Ohio and W. PA. Not sure where you are from but you can always go to their website for more detailed information. Any questions please ask ...
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Jan 11, 2010 |
... holes * Uncured solder mask in the holes, which result in peeling of LPI and trapping contamination inside the holes. The solder mask pads for via holes can be made about 5 mils bigger than the via drill size. This will result in deposition of solder in via holes, reducing the possibility of bridging problems during wave soldering operation. If the via plugging is used to fill open holes with the solder mask to block air leakage during in circuit test, via plugged one side only is the suggested ...
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Jan 6, 2010 |
Automated solder wire feeder Hi, Has anyone have experience with manual soldering iron using automated wire feed? I am looking at poke yoke manual soldering 5 pins LCD and wondering if there are ways to control the volume of the solder applied to the board to minimize missing solder pins. How robust are these kind of units and process and any disadvantages? Thanks. Peter
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Jan 4, 2010 |
... modules manually on the pcb. Due to the PCB design, it has to be TH type (also, it's the only type available) and soldered manually (or using selective soldering equipment which we don't posess). But the worst part is that the module pins have to be cut (shortened) after soldering. Each has 16 pins, and there are 6 of them on the PCB. So, 96 cuts per PCB. As we have to make A LOT of them, I am wondering if there's maybe some kind of machine that can shorten the pins before soldering? - Deni
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