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Addressing the frequent solder bridging, shorting, and solder ball defects of solder paste that occur during SMT placement of devices with 0.3~0.4mm fine-pitch pins, this paper proposes a rapid, reproducible optimization pathway for solder paste printing parameters based on real production line cases. It covers key control points including stencil aperture design, squeegee pressure and speed matching, and solder paste pre-warming and stirring specifications, and emphasizes the decisive influence of solder paste printing stability on the subsequent formation of solder balls during reflow soldering.
Published: 2014-04-07Consumer electronics solder faces the dual challenges of solder bead residue and high solder joint void rate in SMT production lines. Jiajinyuan low-solder-bead low-void consumer electronics solder optimizes the metal powder particle size distribution and flux activity ratio, reducing the number of post-soldering solder beads for 0201 components to ≤3 per square centimeter and stably controlling the BGA solder joint void rate at ≤8%, significantly improving the first-pass yield of consumer electronics solder on high-density PCBs.
Published: 2014-03-19The thickness and aperture design of SMT stencils are core variables determining the forming quality of solder paste printing. For 0402 and 0201 components, the solder paste volume deviation between 0.12mm and 0.15mm stencils can reach 28%. When the aperture aspect ratio is less than 1.5, the edge collapse rate increases by 3 times. Measured data from Jia Jinyuan's production line shows that, under the same pad conditions, trapezoidal apertures improve the solder paste release rate by 12% compared to rectangular apertures.
Published: 2014-02-02
When manually repairing circuit boards, the selection of solder wire diameter directly affects solder joint formation and rework yield. 0.3mm solder wire is suitable for fine touch-up soldering and jumper wiring of small-size SMD components such as 0402 and 0603, while 0.5mm solder wire is more suitable for rapid tinning of QFP pins, power ground pads and large-area copper foils. 20 years of production line tests by JJY show that there are significant differences in melting consistency and wetting spreading ability between the two under the conditions of soldering iron temperature of 320℃ and dwell time of 2 seconds.
Published: 2014-01-28The solution to solder paste printing slump and poor release defects focuses on real production line pain points. From stencil aperture design, solder paste rheological properties, squeegee parameter matching to environmental temperature and humidity control, it systematically sorts out six key factors leading to solder paste slump and poor release, and provides an immediately executable parameter adjustment list and verification methods, helping engineers locate the main cause of solder paste release defects within 30 minutes.
Published: 2014-01-15When reworking and welding precision motherboards, precise temperature control must be applied to protect surrounding micro components. The Jiajinyuan JRY-850B hot air system, paired with an infrared temperature gun for real-time feedback, controls the peak temperature of BGA solder joints at 235±2℃ and limits the temperature rise of surrounding 0201 resistors to below 120℃, avoiding PCB delamination or MLCC hidden cracks caused by thermal stress.
Published: 2014-01-10Solder paste printing skip is a high-frequency defect on SMT production lines, directly related to the rheological properties of solder paste, stencil aperture design, and matching of squeegee parameters. Based on Jiajinyuan's 20 years of production line measurement experience, this paper focuses on solder paste, printing process stability, and root causes of solder paste skip, and proposes an immediately executable six-step troubleshooting method, covering real failure scenarios such as viscosity fluctuation of solder paste batches, insufficient stencil support rigidity, and sudden changes in squeegee pressure.
Published: 2013-12-03
The rosin flux inside the solder wire plays key roles during the soldering process, such as removing oxide films, reducing surface tension, and improving wettability. Its content and distribution directly affect the smoothness of solder joints, tin wetting speed, and cold solder joint rate, making it a core indicator of the actual soldering performance of solder wires.
Published: 2013-11-27Cold solder joints manifest as a lack of intermetallic compound layer between component pins and PCB pads, resulting in poor electrical conduction and insufficient mechanical strength. This defect is commonly observed in actual production line conditions such as insufficient peak reflow temperature, reduced solder paste activity, or severe pad oxidation. For Jiajinyuan solder paste, intensified flux volatilization after continuous printing for over 4 hours will significantly increase the incidence of cold solder joints.
Published: 2013-11-03Eutectic solder has a fixed single melting point in SMT production lines, enabling simultaneous melting and solidification, which significantly reduces thermal stress and void rate. Under the Sn96.5Ag3.0Cu0.5 system, the measured melting point of Jia Jinyuan eutectic solder is stable at 217.5℃±0.3℃, suitable for reflow soldering process control of high-density packages such as BGA and QFN.
Published: 2013-10-28Our technical team is always ready to provide professional solder material selection advice and SMT process solutions.