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The Use of An Argon Inerting System for the Solder Pot of a Wave Solder Machine

IP.com Disclosure Number: IPCOM000019385D
Publication Date: 2003-Sep-12
Document File: 2 page(s) / 34K

Publishing Venue

The IP.com Prior Art Database

Abstract

A common problem with molten solder stored in the solder pot of a wave soldering machine is dross formation. Dross formation results from oxidation of the molten tin/lead alloy solder on exposure to oxygen (air). The average percent solder that forms dross is 50%. Currently, there are no inerting systems in place specifically for the solder pot. The existing systems installed for inerting a wave solder oven and to reduce dross formation, are inert gaseous jets placed adjacent to the waves, and also inert gas flowing into the solder atmosphere of the oven.

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The Use of An Argon Inerting System for the Solder Pot

of a Wave Solder Machine

Problem Definition

A common problem with molten solder stored in the solder pot of a wave soldering machine is dross formation. Dross formation results from oxidation of the molten tin/lead alloy solder on exposure to oxygen (air). The average percent solder that forms dross is 50%. Currently, there are no inerting systems in place specifically for the solder pot. The existing systems installed for inerting a wave solder oven and to reduce dross formation, are inert gaseous jets placed adjacent to the waves, and also inert gas flowing into the solder atmosphere of the oven.

The use of a dual or single-phase argon inerting system would provide direct protection from dross formation in the solder pot. The liquid argon delivery system would displace ambient air and provide a direct inerting process to the solder bath. The advantage of the use of argon over nitrogen is its higher density, hence, providing better dross protection over the solder pot than the current conventional process. Inerting the molten solder will provide increased yield of useful solder resulting in a cost savings to the customer allowing for the cost of argon. The wetting property of the solder is greatly improved as well.

Process Description

The proposed system consists of a closed loop dual or single-phase delivery system to drip liquid argon over a molten solder bath, and distribute gaseous argon inside the wave solder machi...