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High-temperature solder paste and medium-temperature solder paste have distinctly different thermal stress responses, component compatibility, and rework difficulty in SMT production lines due to their melting point differences. High-temperature solder paste is suitable for high-reliability automotive electronics and high-power modules, while medium-temperature solder paste is mostly used in consumer motherboards containing heat-sensitive components such as BGA and MLCC. Incorrect selection will directly cause batch failures such as solder joint voiding, tombstoning, or PCB delamination.
Published: 2026-08-27
The flux content of solder wire directly affects the wetting performance of solder joints: excessively high flux content easily causes blackened residues and PCB corrosion, while excessively low flux content leads to poor wetting and frequent cold solder joints. Based on real failure cases from SMT production lines, this paper analyzes the wetting failure mechanism caused by abnormal flux content, and provides both emergency remediation measures and long-term root-cause solutions.
Published: 2026-08-27
There are significant differences between SMT nitrogen soldering and air soldering in terms of solder paste wettability, void rate, solder joint finish, and flux residue performance in actual production lines. Nitrogen soldering can reduce the void rate of BGA solder joints from 15%~25% in air soldering to 3%~8%, with particularly prominent advantages on OSP copper surfaces, fine-pitch QFNs, and high-reliability military boards, but the cost of nitrogen consumption and equipment compatibility must be weighed.
Published: 2026-08-27
Sn63Pb37 solder paste still has irreplaceable process stability in through-hole SMT production lines. Its eutectic properties bring low melting point, narrow reflow window and excellent wettability. However, limited by RoHS compliance pressure and lead-free mixed line risks, practical applications must directly address high-frequency failures such as solder joint cracking, cold solder joints, insufficient wetting, and stencil clogging, which are particularly evident in 0201 component soldering and double-sided board rework scenarios.
Published: 2026-08-27
New energy circuit boards have extremely high requirements for soldering reliability; even a slight deviation in the selection of solder paste and solder wire can cause batch defects such as cold solder joints, bridging, and excessive voiding rates. Combined with real production line failure cases, this article directly addresses core pain points such as insufficient solder paste activity matching, mismatched silver content in solder wire, and lack of coordination between reflow profile and solder paste melting point, and provides immediately executable material verification processes and parameter locking methods.
Published: 2026-08-27
The shelf life of solder paste and SMT material control are currently facing three major trends: the popularization of low-temperature storage, strengthened batch traceability, and compressed open-container usage timelines. The driving factors include the deepening of lead-free processes, growth in automotive-grade orders, and stricter customer audits. Industry impacts are reflected in increased fluctuation of scrap rates, higher line changeover frequency, and more IQC inspection items. Practitioners need to incorporate solder paste from warehousing to temperature recovery into MES control nodes throughout the entire process, and work backward from the actual production line takt to determine the open-container usage window.
Published: 2026-08-27
The formation causes of wave soldering dross involve the purity of solder bars, oxide film control, and the synergistic imbalance of process parameters. By comparing the dross generation amount of high-purity solder bars and conventional solder bars under different chain speeds, wave heights, and nitrogen protection, combined with the actual line changeover cost and maintenance frequency of the production line, the two-way optimization path of the solder bar process is clarified, providing a feasible selection basis for the mass production of high-reliability PCBs.
Published: 2026-08-27
The QFN void rate standard is tightening from the 25% limit in IPC-A-610 Revision G to the automotive-grade 5% requirement. The void-reduction capability of solder paste has become a dividing line for mass production yield. Low-residue, high-thixotropy, and gradient-evaporation solder pastes are rapidly replacing traditional formulations. Combined with a nitrogen atmosphere and optimized reflow profiles, this enables a systematic reduction in void rates.
Published: 2026-08-27
Low-residue solder paste is a key material for enabling SMT no-clean processes. It can control ionic residues below 10.06μg/cm2 NaCl equivalent after reflow soldering, avoiding leakage, corrosion, and CAF failures caused by rosin or organic acid residues. It is especially suitable for high-density, fine-pitch automotive-grade and medical electronics assembly without underfill.
Published: 2026-08-27
In SMT manual rework soldering scenarios, the choice between rosin-core solder wire and solid-core solder wire must be closely tied to solder joint quality, operational efficiency, and rework risk. Rosin-core solder wire is suitable for rapid rework soldering of small-batch, high-density, low-heat-capacity components, while solid-core solder wire is more appropriate for large pads, high-heat-capacity components, and military or medical PCBA sensitive to residues. The two have essential differences in terms of flux activity, thermal response, cleanability, and cost.
Published: 2026-08-27Our technical team is always ready to provide professional solder material selection advice and SMT process solutions.