Electronics Assembly Knowledge, Vision & Wisdom
Nitrogen Effect For Wave Soldering
Nitrogen Effect For Wave Soldering
Paper describes the implementation of a wave soldering system using inert gas with economic benefits analyzed.
Production Floor

Authored By:
Han-Na Noh, Jae-Chan Kim, Dong-Woon Park, Il-Je Cho, Min-Jin Oh
LG Electronics
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Transcript
Recently, with significant increases in solder manufacturing costs due to raw materials, electronics assemblers are finding solutions that save cost by reducing dross.

This paper describes the implementation of a wave soldering system using inert gas.

The system based on the PSA-generated nitrogen with residual oxygen levels of 100 parts-per-million has a low maintenance cost and is simple to retrofit.

In this study, technical results and economic benefits are analyzed by feasibility and actual test.

To analyze the effects of comparing nitrogen wave soldering with conventional soldering, the authors evaluated the wettability of assemblies, dross and solder joint reliability.

The inert wave soldering system showed significant dross reduction and its wettability was better than conventional.
Summary
Recently, with significant increasing of solder manufacturing cost due to raw materials, electronics makers are also faced with the same difficulty. And they are finding solutions that save cost by reducing the dross. This paper describes the implementation of a wave soldering system using inert gas. The system based on the PSA-generated nitrogen with residual oxygen levels of 100 ppm has low maintenance cost and is very simple to retrofit.

In this study, technical results and economic benefits are analyzed by feasibility and actual test. To analyze the effects of comparing nitrogen wave soldering with conventional air condition, we have evaluated the wettability of assemblies, dross and solder joint reliability. The inert wave soldering system shows significant dross reduction and its wettability is better than conventional. Also SEM analysis from solder joint shows good results.
Conclusions
This paper describes the implementation of a Nitrogen inerting retrofit system in a high volume, mixed-assembly plant where consumer products are manufactured. The conversion of existing wave soldering equipment to nitrogen was very simple to retrofit. The system based on the PSA-generated nitrogen with residual oxygen levels of 100ppm lowers dross production, helping assemblers realize a considerable operational cost savings. By reducing oxidation, wettability and reliability of the joint were improved. In on going work, we will measure the bonding strength of solder joints after thermal shock test and analyze the failure modes to evaluate the reliability of the solder joints.
Initially Published in the IPC Proceedings
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