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Both quantitative and qualitative tests for solderability exist. [6] The two most common testing methods are the 'dip and look' method and wetting balance analysis.In both of these tests, the soldered pieces undergo an accelerated aging process before being tested for solderability, to take into consideration the time a component was in storage prior to mounting to final assembly.
An improperly soldered 'cold' joint, where the wire was not sufficiently heated Broken solder joints on a circuit board. The joint on the right, although unbroken, has separated from the board. Various problems may arise in the soldering process which lead to joints which are nonfunctional either immediately or after a period of use.
Fillets commonly appear on welded, soldered, or brazed joints. Depending on a geometric modelling kernel different CAD software products may provide different fillet functionality. Usually fillets can be quickly designed onto parts using 3D solid modeling engineering by picking edges of interest and invoking the function. Smooth edges ...
Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1]
The defining characteristic of a wiped joint is that the soldering process involves mechanically working or 'wiping' the joint. [1] As well as heating solder and applying it to the joint, the solder is shaped into place manually, wiping it with a non-metallic tool to form a smooth-surfaced outer shape.
Solder, drawn out to a diameter of 1.6 mm and wound/bent around a spool A soldered joint used to attach a wire to a through-pin of a component on the rear of a printed circuit board (not a customary application of such joints) Solder (UK: / ˈ s ɒ l d ə, ˈ s ə ʊ l d ə /; [1] NA: / ˈ s ɒ d ər /) [2] is a fusible metal alloy used to ...
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Widely used. Strong lead-free joints. Silver content minimizes solubility of silver coatings. Not recommended for gold. Produces strong and ductile joints on Copper and Stainless Steel. The resulting joints have high tolerance to vibration and stress, with tensile strengths to 30,000 psi on Stainless. [74] Sn 94 Ag 6: 221: 279 [74] Yes: No