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SMT soldering of thick copper boards is prone to cold solder joints and insufficient soldering due to their large heat capacity and delayed temperature rise. Solder paste activity matching and precise control of the reflow temperature profile are required to ensure solder joint reliability. The ramp-up rate in the preheating zone must be controlled between 0.5℃/s and 1.5℃/s, and the peak temperature must meet the component class limits specified in IPC-J-STD-020D. Otherwise, batch failures such as solder balls, tombstoning, and PCB delamination will occur.
Published: 2026-08-27
In the double-sided mounting process, the solder paste soldering reliability of the second reflow pass is highly dependent on printing accuracy, reflow profile matching, and component heat capacity coordination. Based on measured data from mass production lines, this paper explicitly specifies key parameters including a stencil thickness of 0.12mm, a squeegee pressure of 2.8kg, and a reflow peak temperature of 235℃±2℃, and points out that the risk of re-melting of already soldered components on the A side during the B-side reflow pass is concentrated on resistors and capacitors below 0603 and the bottom pads of QFN packages.
Published: 2026-08-27
The SMT solder paste cleaning process must be precisely matched to the solder paste type. Although no-clean solder paste is nominally described as requiring no cleaning, the risk of ionic residue still needs to be evaluated in high-reliability scenarios. Water-washable solder paste, by contrast, must be paired with a complete cleaning process such as deionized water spraying, ultrasonic cleaning, or brushing. The two types differ fundamentally in cleaning equipment selection, water quality control, and residue inspection.
Published: 2026-08-27
Addressing the pain points of high manual soldering costs and high rework rates for multi-pin connectors, this summary focuses on optimizing the practical wire feeding methods for solder wire, and proposes 6 immediately implementable cost-reduction actions, covering key links such as soldering tip selection, flux dosage control, and solder feeding rhythm adjustment. A single action can reduce the manual time for a single solder joint by up to 32%, saving over 1400 hours of rework time annually.
Published: 2026-08-27
01005 components are gaining rapid adoption in high-density PCB assembly, and solder paste printing precision has become a yield bottleneck. The industry is addressing this challenge through stencil aperture optimization, closed-loop control of squeegee pressure, and hierarchical management of solder paste rheological properties, while production lines need to simultaneously upgrade AOI recognition algorithms and operators' microscope re-inspection capabilities.
Published: 2026-08-27
Reflow profile adjustment during SMT soldering with halogen-free solder paste is a core factor affecting solder joint reliability and defect rates. Based on 20 years of practical production line experience, this paper directly addresses common high-frequency issues such as solder balls, tombstoning, and poor wetting. Focusing on four key variables—heating rate, soaking time, peak temperature, and cooling rate—it provides immediately actionable parameter fine-tuning solutions and error-prevention guidelines.
Published: 2026-08-27
The sharp surge in dross generation during wave soldering solder bar replacement has become a high-frequency pain point on production lines. The industry is shifting from experience-based judgment to data-driven solder pot management, systematically reducing dross by optimizing the solder bar addition rhythm, controlling molten oxygen content, and upgrading the dross scraping frequency logic. This not only reduces material loss rates and downtime frequency, but also forces enterprises to restructure the daily maintenance SOP for soldering pots, with frontline process engineers required to master the synergistic relationship between the trend of solder viscosity changes and the critical point of flux carbonization.
Published: 2026-08-27
The selection of SMT stencil thickness is shifting from experience-driven to solder paste alloy property adaptation-driven. Lead-free high-melting-point alloys have pushed the proportion of ultra-thin stencils below 0.12mm to 38%, while low-temperature solder paste has shown a 12% increase in collapse rate on 0.15mm stencils in production line measurements. Process engineers need to dynamically adjust stencil thickness based on three key factors: alloy melting point, powder particle size, and flux activity.
Published: 2026-08-27
Sn63Pb37 leaded solder paste remains irreplaceable in high-reliability fields such as automotive electronics and industrial control due to its eutectic properties and compatibility with mature processes. Its reflow process parameters are evolving toward narrower windows, higher consistency, and stronger equipment coordination. The driving factors include the domestic reflow soldering temperature control accuracy being improved to ±1.5℃, the Tg value of PCB boards generally rising above 150℃, and the proportion of 0201 and smaller package devices exceeding 38%. Practitioners need to simultaneously upgrade the calibration frequency of reflow profilers, refine the compensation rules for stencil apertures, and establish a batch-specific mapping table between solder paste viscosity and printing speed.
Published: 2026-08-27
Through-hole reflow soldering is shifting from an experimental process to mass production applications, with stencil design and solder paste selection becoming key bottlenecks that determine first-pass yield. The industry is currently facing common issues such as poor coplanarity of through-hole component pins, insufficient solder paste filling, and high void rates after reflow, while practical solutions including high-viscosity solder paste, stepped stencils, and double-sided printing are being rapidly implemented.
Published: 2026-08-27Our technical team is always ready to provide professional solder material selection advice and SMT process solutions.