The tubing should be of sufficient length to cover the solder joint and extend over the insulation of each conductor a minimum of 5 mm (0.20 in.). The shrink tubing has been properly installed, resulting in exposure of the conductive surface. The completed solder joint shall be over-sleeved with transparent/translucent heat shrink tubing of sufficient length to cover the solder joint and extend over the insulation of each conductor a minimum of 5 mm (0.20 in.). In multiple conductor configurations, the conductor insulation gaps shall be approximately equal. The conductor(s) shall exhibit proper insulation spacing. In multiple conductor configurations, the direction of each additional conductor wrap shall be alternated, and shall not overlap. The conductor and the component lead shall be aligned approximately 90º to, and in contact with, each other. Excessive overlap increases stress on the component lead and body seal/weld bead. The soldered section shall be a minimum of 5-8 mm (0.2 - 0.3 in.) in length, but should not contact the insulation jacket(s) or the lead seal/weld bead. The solder section shall be a minimum of 5-8 mm (0.2 - 0.3 in.) in length. The conductors in the splice section shall be in parallel, overlapping contact to each other. The components exhibit acceptable solder terminations and are sleeved to provide strain relief. The component lead shall be sleeved with tubing, between the lead seal/weld bead to within 2 lead diameters of the solder joint (if applicable). Solder sleeves are typically larger than that achievable with a lap or lash splice.Īngular misalignment of less than 2 lead diameters (measured at the conductor ends of the splice section) is allowable, provided there are no protruding or sharp edges.Īngular misalignment in excess of 2 lead diameters (measured at the conductor ends of the splice section) produces a mechanically weak solder joint, with protruding ends or sharp edges. Originally developed for the termination of cable shield drain wires, solder sleeves produce a one-step, insulated and sealed splice. The splice section shall be bent back against the larger conductor and strain-relieved. The splice is suitable for situations where the termination may be subjected to tensile loading.Īfter stripping and preparing for soldering, the ends of the wires shall be twisted together a minimum of three turns in an end slice configuration, soldered and insulated. This splice is best suited for the termination of wire and cable, but can be used for the termination of discrete component leads. The splice may be simple or complex, and is more compact than a solder sleeve. The splice may be simple or complex, and is more compact than a solder sleeve.Ī lash splice is a structural splice, consisting of a lap splice with a single strand overlash winding mechanically binding the lead and conductor together. The termination has good tensile properties, but is prone to solder joint fatigue if repeatedly flexed.Ī lap splice is a non-structural splice, where the component lead end and the conductor end are soldered in parallel, overlapping contact to each other. This splice is typically used to terminate discrete, leaded components in "daisy-chain" configurations. The lash splice can be used to attach a ground lead/drain wire to a shielded cable in instances where a solder sleeve is impractical or too bulky. For inline configurations, the splice section may be bent back against the larger conductor(s) and sleeved for strain-relief. The end splice is a version of the lash splice, where the conductor ends are laid side by side, wrapped, soldered, and then insulated with shrink tubing. These terminations impose stress relief requirements on the solder joint and the component lead seals that must be addressed to ensure reliable operation. THROUGH-HOLE SOLDERING SERVICE LEAD SPLICES THROUGH-HOLE SOLDERINGĭesign applications may require the termination of a discrete leaded component in a non-standard configuration, where the components are not terminated in the manner originally designed for the package type, the component's leads are being used as terminals, and/or where the termination method is not addressed in the NASA standards.
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