Blue tip for soldering. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Blue tip for soldering. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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My torch is an ejection type, for high temperature soldering. Works from a cylinder with liquefied gas. It is economical: the amount of gas supplied to the ejector can be adjusted. The burner is arranged as follows. From the reducer or valve valve on the cylinder, gas is supplied through a hose to a supply pipe built into the base of the burner. From there, it enters through the vertical channel of the rack into the central hole of the jet housing, where its amount is dosed by an adjusting needle mounted on a thread in the housing cover. Next, the gas enters the jet and is ejected at high speed through its hole.

Sucking air from the cavity of the air spool necessary for combustion, the gas is supplied through the axial channel of the radiator to the divider, where it is divided into the main, central flow, and the auxiliary one, supplying the peripheral openings of the divider, necessary to maintain the flame. With the help of a rotary spool sleeve with radial holes put on the ejector, the volume of incoming air can be dosed, and with the help of an adjusting needle - the amount of gas. This allows the burner flame to be shaped both in size and quality.

All parts of the burner, except for the handle, are machined on a lathe. An excellent material for making most of them is brass or bronze. They have good thermal conductivity, are strong enough and are not afraid of corrosion. But the jet body, its cover and the jet itself are best made of steel. The easiest way to make an adjusting needle is from a steel knitting needle. And the gland for sealing the thread will have to be machined from fluoroplastic: although the radiator takes some of the heat, the body parts get quite hot.

Gas burner (click to enlarge): 1 - adjusting needle, 2 - needle handle, 3 - jet body cover, 4 - jet body, 5 - stuffing box (PTFE seal), 6 - burner base, 7 - clamping nut, 8 - ejector , 9 - jet, 10 - spool sleeve, 11 - spool holder, 12 - radiator, 13 - divider, 14 - handle, 15 - inlet tube

It is not difficult to manufacture according to the given drawings and assemble the burner. Only with the jet will have to tinker. To get an exit hole with a diameter of about 0,1 mm, I first drill a through hole with a diameter of 0,4 mm, and then gently caulk it with a small ball to the desired size. This work requires patience and skill, so the jet may not work on the first try. But it doesn’t matter: it’s easier to carve a new blank than to try to fix a bad one.

The assembly sequence is as follows. The jet is wrapped in the body, having previously lubricated the mating surfaces with epoxy. On the other side of the housing, a fluoroplastic seal is inserted and tightened with a threaded cap with an adjusting needle. The jet body is placed in the base of the burner and secured with a clamp nut. Then the ejector is screwed onto the body, the spool part and the radiator with a divider are put on. You can light the burner.

The flame of a properly manufactured and adjusted burner will have a blue color and the shape of a straight narrow flame up to 200 mm long.

Author: A.Nikolaev

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