New Equipment | Solder Paste Stencils
These fixture plates facilitate the controlled dipping of flux or paste onto the balls under the BGA packages. Flux or paste is controlled at a depth of 50-60% per cent of the ball diameter prior to placement of a BGA or to place a PoP component on t
New Equipment | Education/Training
If you are trying to instruct new electronic technicians, high schoolers, or DIYers in the skill of soldering and do not want to instruct them on home made PCBs that are not representative of the type parts or the types of surface finish you would ex
Electronics Forum | Wed Apr 19 04:41:42 EDT 2006 | ge_lim
Hi I am using selective soldering to dip soldering the connector pins to the PCB and would like to know your experience: a) Is there a recommended dip or dwell time for the dip soldering? b) How do we improve the solder coverage in the TH? c) How t
Electronics Forum | Thu Apr 20 08:49:08 EDT 2006 | Chunks
a) Is there a recommended dip or dwell time for the dip soldering? Check your data sheet for the part. Dwell time is everything in selective soldering. Top side wetting is a good process indicator. b) How do we improve the solder coverage in the
Industry News | 2018-10-06 11:20:42.0
How to Maintain a Reflow Oven?Proper reflow overn maintenance can extend its life cycle, keep the machine in good condition, and improve production efficiency and product quality.
Industry News | 2018-10-18 09:02:41.0
How to Solder a Surface Mount Device to a PCB Pad
Technical Library | 2017-05-17 22:33:43.0
The selective soldering application requires a combination of performance attributes that traditional liquid fluxes designed for wave soldering applications cannot fulfill. First, the flux deposition on the board needs to be carefully controlled. Proper fine tuning of the flux physicochemical characteristics combined with a process optimization are mandatory to strike the right balance between solderability and reliability. However, localization of the flux residue through the drop jet process is not enough to guarantee the expected performance level. The flux needs to be designed to minimize the impact of unavoidable spreading and splashing events.From this perspective a fundamental understanding of the relationships between formulation and reliability is critical. In this application, thermal history of the flux residues (from room temperature to solder liquidus) is a key performance driver. Finally, it is necessary to conduct statistically designed experiments on industrial selective soldering machines in order to map the relationships between flux characteristics and selective process friendliness.
Technical Library | 2019-08-07 22:56:45.0
The requirement to reconsider traditional soldering methods is becoming more relevant as the demand for bottom terminated components (QFN/BTC) increases. Thermal pads under said components are designed to enhance the thermal and electrical performance of the component and ultimately allow the component to run more efficiently. Additionally, low voiding is important in decreasing the current path of the circuit to maximize high speed and RF performances. The demand to develop smaller, more reliable, packages has seen voiding requirements decrease below 15 percent and in some instances, below 10 percent.Earlier work has demonstrated the use of micro-fluxed solder preforms as a mechanism to reduce voiding. The current work builds upon these results to focus on developing an engineered approach to void reduction in leadless components (QFN) through increasing understanding of how processing parameters and a use of custom designed micro-fluxed preforms interact. Leveraging the use of a micro-fluxed solder preform in conjunction with low voiding solder paste, stencil design, and application knowhow are critical factors in determining voiding in QFN packages. The study presented seeks to understand the vectors that can contribute to voiding such as PCB pad finish, reflow profile, reflow atmosphere, via configuration, and ultimately solder design.A collaboration between three companies consisting of solder materials supplier, a power semiconductor supplier, and an electronic assembly manufacturer worked together for an in-depth study into the effectiveness of solder preforms at reducing voiding under some of the most prevalent bottom terminated components packages. The effects of factors such as thermal pad size, finish on PCB, preform types, stencil design, reflow profile and atmosphere, have been evaluated using lead-free SAC305 low voiding solder paste and micro-fluxed preforms. Design and manufacturing rules developed from this work will be discussed.
www.unisoft-cim.com/solder.htm - The ProntoSELECTIVE-SOLDERING module from Unisoft is used by electronics manufacturers to generate the necessary programs for automatic PCB Selective Soldering machines in minutes. ProntoSELECTIVE-SOLDERING helps prog
How to Maintain a Reflow Oven Proper reflow overn maintenance can extend its life cycle, keep the machine in good condition, and improve production efficiency and product quality. One of the most important tasks for properly maintaining a reflow ove
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