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发布于:2019-3-27 10:59:52  访问:115 次 回复:0 篇
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Soldering Iron Brands
There are often two forms of material used to make a multilayer board. Pre-preg material is thin levels of fiberglass pre-impregnated by having an adhesive, and it is in sheet form, usually about .002 inches dense. Core product is similar to an extremely double that is thin board for the reason that it features a dielectric product, such as for example epoxy fiberglass, having a copper layer deposited on each side, frequently .030 thickness dielectric material with 1 ounce copper layer for each side. In a multilayer board design, there are two techniques utilized to build up the specified range levels. The core stack-up technique, that will be an older technology, runs on the center layer of pre-preg material by having a layer of core material above and another layer of core material below. This combination of one layer that is pre-preg two core levels would produce a 4 layer board.
The film stack-up method, a newer technology, might have core material while the center layer followed by layers of pre-preg and copper material developed above and below to make the final range levels required by the board design, kind of like Dagwood building a sandwich. This process permits the manufacturer flexibility in how the board layer thicknesses are combined to satisfy the finished product thickness demands by varying the number of sheets of pre-preg in each layer. When the material layers are finished, the entire stack is afflicted by temperature and stress that causes the adhesive into the pre-preg to connect the core and pre-preg levels together right into a single entity.
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Even if this is your first time copper that is soldering, i will allow you in for a Secret step that many plumbers will perhaps not tell you about.
Why? Good concern and this can be a response.
Most plumbing technicians think that if there solder joints look much better than their colleagues they`ve been a better plumber. Believe me when I tell you, most plumbers are extremely condescend and competitive and in truth a good looking solder joint takes time and training.
Secret 6th Action Which Will Improve Your Solder Finishes.
Once you`ve filled your hub with solder you are going to begin to see the solder form and commence to dry around the hub and may overflow and run even over the fitting. Here is what you will should do and have now readily available.
You will need a moist cloth towel called a wiping towel or any old rag can do.
Additionally you desire a spray container filled with water.
Although the solder is still in its form that is molten take damp cloth and wipe the solder around the hub. At the exact same time as you wipe your objective is always to attempt to push as much regarding the solder into the hub associated with the fitting. Be mindful as the solder, fitting and pipe have become hot.
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