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QFN soldering on new energy electronic control boards faces dual challenges of high-frequency vibration and thermal cycling. By optimizing stencil aperture design, reflow profile, and pad design, Jiajinyuan has increased the thrust of QFN solder joints to over 28N, with the IMC layer thickness controlled at 3.2μm±0.4μm, effectively suppressing microcrack propagation and meeting the long-term reliability requirements of automotive-grade IPX7 protection and operating conditions ranging from -40℃ to 125℃.
Published: 2022-12-11
The temperature control range of solder bars in wave soldering machines is typically 250°C to 265°C, which should be comprehensively adjusted based on the alloy composition of the solder bar, PCB thickness, component density, and flux activity. Excessively high wave soldering temperatures can easily cause copper foil peeling and thermal damage to components, while excessively low temperatures can lead to cold solder joints, solder spikes, and bridging. In actual production lines, dynamic fine-tuning must be performed by combining solder fluidity tests and solder joint cross-section analysis.
Published: 2022-11-29For soldering gold-plated boards, it is necessary to balance the thickness of the pad gold layer with the activity matching of the flux to avoid black pad, cold solder joints, and excessive IMC growth. Jia Jinyuan's gold-plated board soldering solution has achieved a soldering defect rate below 0.3% in aerospace modules and medical equipment, with the key lying in the collaborative implementation of solder paste selection, reflow profile gradient control, and an oxygen content ≤100ppm under a nitrogen atmosphere.
Published: 2022-11-255G device solder must meet the dual stringent requirements of high-frequency signal integrity and thermal cycle reliability. Jinyuan JNY-5G188 lead-free solder achieves zero void rate soldering in scenarios such as base station power amplifier modules and router RF motherboards. Its low-silver ratio and active flux synergistically optimize wetting speed and residue insulation.
Published: 2022-11-11Conduct actual measurements on small-batch samples of sensor soldering solder to verify its wetting and spreading performance and void rate control capability under the conditions of 0.3mm pitch micro-pads and gold-plated nickel-palladium-gold surface treatment, with a focus on examining the bridging suppression effect and IMC layer uniformity of Jiajinyuan JH-851A lead-free solder at a peak temperature of 235℃ under a nitrogen atmosphere.
Published: 2022-10-29As a high-frequency industrial by-product generated in SMT production lines, solder dross typically has a tin content of 60% to 75%. Through Jia Jinyuan's dedicated centrifugal separation and low-temperature smelting processes, over 92% of metallic tin can be stably recovered and directly reused in solder paste formulation or wave soldering bath replenishment, reducing the factory's overall tin material loss rate from the traditional 3.8% to within 1.2%.
Published: 2022-10-16The stability control of batch viscosity and alloy fluctuation of solder paste focuses on the root causes of solder paste quality fluctuations in actual production lines. By real-time monitoring of viscosity changes and alloy composition deviations of batch solder paste, combined with dynamic calibration of printing parameters, it effectively suppresses defects such as insufficient solder, solder bridging, and solder collapse caused by batch differences in solder paste, and practically improves the SMT first-pass yield and long-term process capability.
Published: 2022-10-11Nitrogen reflow in BGA/QFN precision soldering suppresses oxidation, improves wettability, and optimizes the flowability of molten metal, stably reducing the void rate from 18%~25% under air reflow to 4.2%~6.8%. The measured purity of the Jiajinyuan nitrogen generator reaches 99.999%, with a dew point ≤ -60℃. Combined with precise flow control (15~25L/min) and real-time monitoring of furnace oxygen concentration (≤100ppm), it can directly reuse existing reflow oven hardware to complete production line upgrades.
Published: 2022-09-19
Silver-containing solder wire and SAC305 solder paste can achieve stable soldering on actual SMT production lines, but the reflow temperature profile and flux activity must be strictly matched; otherwise, problems such as poor wetting, increased void rate, and abnormal thickening of the IMC layer are likely to occur, with particularly sensitive performance on QFN and 0201 components. This combination has been verified as feasible in Jia Jinyuan's 20-year mass production cases, provided that the silver content of the solder wire is controlled at 2.0% to 3.2%, the metal content of the solder paste is maintained at 88.5% ± 0.3%, and the reflow peak temperature is locked at 235°C ± 2°C.
Published: 2022-09-15Manual soldering is an irreplaceable key process in circuit board repair and rework. Especially during BGA rework, 0201 component touch-up soldering, and operations in heat-sensitive areas of multilayer boards, the coordinated matching of soldering iron temperature, solder wire activity, and solder paste rheological properties directly determines solder joint reliability. Jiajinyuan solder paste stands out in low-temperature wettability, residue insulation, and reflow stability. When used with constant-temperature soldering irons and micro-diameter soldering tips, it can significantly reduce the risk of thermal damage.
Published: 2022-09-05Our technical team is always ready to provide professional solder material selection advice and SMT process solutions.