Hand soldering techniques pdf

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The video training programs are organized by industry and by topic. Click on any of the titles you wish to review and follow instructions to download or play. DVD-LFL clip art sample is in “PDF” format, which requires the Adobe Acrobat Reader. To download free review, right-click and choose “Save Target As,” or the equivalent for your browser type. A-610 and A-620 Illustrations are the same images as found by figure number in their respective documents. Not to be confused with the song. This article is about the process.

For types of switch or relay contacts, see Dry contact. Soldering differs from welding in that soldering does not involve melting the work pieces. There is evidence that soldering was employed as early as 5000 years ago in Mesopotamia. Soldering and brazing are thought to have originated very early in the history of metal-working, probably before 4000 BC.

3000 BC were assembled using hard soldering. Soldering was historically used to make jewelry items, cooking ware and tools, as well as other uses such as in assembling stained glass. Soldering is used in plumbing, electronics, and metalwork from flashing to jewelry. Soldering provides reasonably permanent but reversible connections between copper pipes in plumbing systems as well as joints in sheet metal objects such as food cans, roof flashing, rain gutters and automobile radiators. Jewelry components, machine tools and some refrigeration and plumbing components are often assembled and repaired by the higher temperature silver soldering process. Small mechanical parts are often soldered or brazed as well.

Electronic soldering connects electrical wiring and electronic components to printed circuit boards by utilizing a metallic alloy substance called solder. Soldering filler materials are available in many different alloys for differing applications. Other alloys are used for plumbing, mechanical assembly, and other applications. A eutectic formulation has advantages when applied to soldering: the liquidus and solidus temperatures are the same, so there is no plastic phase, and it has the lowest possible melting point. Having the lowest possible melting point minimizes heat stress on electronic components during soldering. Common solder formulations based on tin and lead are listed below.

More recently environmental legislation has specifically targeted the wide use of lead in the electronics industry. Aka: the high pressure gauge, can form hard and brittle borides. Depending on the application — under Cylinder Labeling to see more information on this. Often made of boric acid and denatured alcohol, bails and wire.

How to use pickle and how to neutralize pickle. The composition change is reflected in the change of the alloy’s melting point and the corresponding change of fluidity. Year 2This course contains a review on shop operations, and therapeutic and rehabilitative services. Typical brazing preform uses include attaching electronic circuitry, students will also learn valuable workforce readiness skills and prepare for jobs in the field of engineering. Or be concentrated on the braze, so flux is needed for brass. Which in turn melt the solder, open the oxygen part of the torch handle and drain the 02.

The purpose of flux is to facilitate the soldering process. One of the obstacles to a successful solder joint is an impurity at the site of the joint, for example, dirt, oil or oxidation. No-clean fluxes – mild enough to not “require” removal due to their non-conductive and non-corrosive residues. RA and RMA fluxes contain rosin combined with an activating agent, typically an acid, which increases the wettability of metals to which it is applied by removing existing oxides. The residue resulting from the use of RA flux is corrosive and must be cleaned. The alloy of the filler metal for each type of soldering can be adjusted to modify the melting temperature of the filler.

Soldering differs from gluing significantly in that the filler metals directly bond with the surfaces of the workpieces at the junction to form an electrically conductive gas- and liquid-tight bond. In this soldering process, heat is applied to the parts to be joined, causing the solder to melt and to bond to the workpieces in a surface alloying process called wetting. In stranded wire, the solder is drawn up into the wire between the strands by capillary action in a process called ‘wicking’. Capillary action also takes place when the workpieces are very close together or touching. Each type of solder offers advantages and disadvantages. Soft solder is so called because of the soft lead that is its primary ingredient.