REG NASA-LLIS-1389-2004 Lessons Learned Observed Heat Fire Hazard Due to Soldering Iron Switch Failures.pdf
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1、Lessons Learned Entry: 1389Lesson Info:a71 Lesson Number: 1389a71 Lesson Date: 2004-02-13a71 Submitting Organization: MSFCa71 Submitted by: Prince Kalia/ Lisa CarrSubject: Observed Heat/Fire Hazard Due to Soldering Iron Switch Failures Abstract: This lesson is intended to broaden awareness of an obs
2、erved problem with some models of the Weller Model TCP12P Soldering Iron. Recommendations apply to soldering irons in general.Description of Driving Event: NASA has issued a Government Industry Data Exchange Program (GIDEP) ALERT, #H1-A-04-01 regarding the Weller Model TCP12P Soldering Iron. Due to
3、a mechanical temperature control switch which works based on a ferromagnetic sensing action, two previously undocumented failure modes were observed with this model. The failures were observed in a laboratory setting with minimal damage. The worst of these two modes involves the switch sticking in t
4、he “Full On“ mode. If this occurs, the soldering iron will go into a “Thermal Runaway“ condition, which will allow the iron to reach temperatures of approximately 1200 F, at the heater/tip interface. Obviously, this could result in possible fire, injury, and/or damage to any article being processed.
5、 This temperature estimate is based on the mass and length of the soldering iron tip, and may vary depending on which tip is installed at the time the failure occurs. A tip with larger mass and greater length will lower the maximum temperature possible during the “Thermal Runaway“ condition. A tool
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