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Multiple reflow soldering cycles significantly weaken solder joint reliability, caused by the superposition of irreversible changes such as repeated growth of the intermetallic compound layer, IMC embrittlement, solder grain coarsening, and increased void rate. In production lines, scenarios such as BGA rework, mixed double-sided board assembly, and stacked board assembly often trigger secondary or even tertiary reflow, so risks must be controlled through coordinated optimization of temperature profiles, solder paste selection, and pad design.
Published: 2026-08-27
Flux spatter from solder wire causing PCB component damage is a common persistent issue in SMT rework and hand soldering, rooted in differences in flux activity, volatilization rate, melt viscosity, and solder wire structure. Based on production line measurements, this paper compares the spatter tendency, residual corrosivity, and operational tolerance window of three types of solder wire flux—rosin-based, no-clean, and water-soluble—in typical scenarios such as 0402 chip resistor rework, QFN32 thermistor device touch-up soldering, and high-power LED pad reinforcement. It explicitly recommends rosin-based solder wire for high-density fine-pitch rework, restricts water-soluble type exclusively to copper-free bare aluminum substrates, and identifies no-clean type as having the best overall performance in conventional through-hole and double-sided board soldering.
Published: 2026-08-27
Through-hole reflow process is rapidly replacing traditional wave soldering, and solder paste consumption has become a yield bottleneck: excessive paste causes bridging and tombstoning, while insufficient paste leads to cold solder joints and poor solder climb. The industry is systematically tightening the control precision of solder paste consumption through means such as stencil aperture optimization, stepped thickness design, and dynamic compensation of printing parameters.
Published: 2026-08-27
In the actual operation of SMT production lines, even when using solder paste from the same batch, defects such as cold solder joints, solder bridges, or tombstoning still occur frequently. The root cause lies in the coupled influence of multiple variables including printing accuracy, reflow profile, stencil tension, and ambient temperature and humidity. Based on 20 years of frontline commissioning experience, this article directly addresses the five practical root causes of solder paste soldering variations, covering key parameters such as squeegee pressure of 3.5～4.2kg, stencil aperture area ratio ≥0.66, and reflow peak temperature of 235±2℃, and provides immediately actionable calibration paths.
Published: 2026-08-27
During the reflow soldering process of a moisture-absorbed PCB, internal water vaporizes rapidly, causing solder paste splattering. This is essentially caused by the conflict between MSL level failure as specified in J-STD-020D and the acceptability criteria in IPC-A-610G. When the PCB moisture absorption exceeds 0.15%wt and the heating rate in the preheat zone exceeds 3℃/s, the water vapor pressure exceeds the strength of the solder paste film layer, triggering splattering. Frontline operators often mistakenly attribute this to excessively high solder paste activity, while ignoring out-of-control baking parameters.
Published: 2026-08-27
Frequent open solder joint defects on 0201 components often stem from a mismatch between the rheological properties of solder paste and the aperture accuracy of SMT stencils. Based on measured data from mass production lines, this paper points out that selecting no-clean solder paste with a thixotropic index ≥0.75 and particle size D50 ≤18μm can increase solder joint tensile strength by 32%. When paired with a laser-etched SMT stencil with an aperture area ratio ≥0.65, the open solder joint rate drops from 4800ppm to 620ppm.
Published: 2026-08-27
Excessive floating dross in the solder bar melting pool directly affects wave soldering yield and equipment service life. This paper conducts a horizontal comparison of the dross performance of three mainstream solder bar types—high-activity solder bars, low-dross solder bars, and phosphorus-containing solder bars—across five dimensions: real production line failure frequency, solder dross generation rate, flux compatibility, maintenance man-hours, and long-term costs. It explicitly states that low-dross solder bars should be prioritized for small and medium-volume mixed-assembly PCB scenarios, while phosphorus-containing solder bars must be paired with an upgraded wave soldering oxidation suppression system for continuous production of high-copper-content PCBs.
Published: 2026-08-27
In SMT production of mixed panel assemblies, the splicing of PCBs with different sizes, thicknesses, and heat capacities makes it difficult to uniformly adapt the reflow profile. The mismatch between the activity window of solder paste and the actual temperature rise rhythm can easily cause defects such as cold solder joints, tombstoning, and cold soldering. This article directly addresses the real pain points of the production line, and provides an immediately executable collaborative solution for the reflow profile of mixed panel assemblies around four dimensions: solder paste selection, fine-tuning of furnace temperature zones, compensation of stencil apertures, and auxiliary heat equalization with carriers.
Published: 2026-08-27
Uneven thickness in SMT printing is one of the most frequent solder paste printing defects on production lines, directly causing soldering defects such as insufficient solder, solder bridging, and tombstoning. The root cause often lies in the combined effect of stencil tension attenuation, squeegee wear, and uneven PCB support. It is necessary to quickly locate deviation points by combining real-time SPI data, and then achieve a thorough solution through stencil life management, closed-loop calibration of squeegee pressure, and optimization of fixture structure.
Published: 2026-08-27
Excessive soldering iron temperature will accelerate the oxidation of solder wire, cause peeling of pad copper foil, thermal damage to components, and frequent cold solder joints and false solder joints. According to Clause 8.2.3 of IPC-J-STD-001H, the recommended temperature range for manual soldering iron welding is 300℃～380℃, and exceeding 400℃ constitutes a process failure risk. In actual production lines, more than 75% of solder joint wetting defects are directly related to temperature out-of-control.
Published: 2026-08-27Our technical team is always ready to provide professional solder material selection advice and SMT process solutions.