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ELECTRIC ARC-METAL SPRAYING LAME spraying, which is basi cally the heat softening of fusi ble materials and their projection on to a prepared base material to form a surface coating, has undergone many advances since the effect was observed in the early 1900s and a newcomer to give the process more flexibility is now introduced by Met- co. The Type 2R system utilizes an electric arc to 'melt' twin metal wires fed into a spray gun. Com some cases, applied without an in aluminium, 308 ft 2 of bronze, 644 ft2 pressed air projects the resulting itial bond-coat material. This is of Babbitt, 490 ft 2 of alloy steels or particles as a well-defined spray balanced by a tendency for the high 700 ft 2 of zinc an hour per ·001 in of stream, the process providing an arc temperature to burn-off certain coating thickness. No change to the economical alternative to the use of. alloyin g elements, altering the gun is required when changing from chemistry of some sprayed coatings oxy/acetylene gases in applying one metal to another. sprayed metal coatings. when applied at high speed. The When an initial bond-coating is to wider spray stream also gives re be applied, a simple switch duced deposit efficiencies. automatically adjusts arc and com Thous or inches The main feature of the new Type pressed air to preferred paramaters. 2R system is the reduction in size Starting and stopping the spray is The spray will build up on a and weight of the spray gun and its controlled by a switch locally at the prepared surface to form a coating associated power supply, making it gun or by pushbutton at the remote which can be a few thousandths of truly portable. The equipment meets control/power unit. Switching off an inch to a few inches in thickness. industry's need for a compact, yet the gun is arranged through a con Resulting coatings are tough, dense reliable, arc system that can be trolled sequence which ensures that and applied at high spray rates per taken on site or easily manoeuvred the equipment is set for an instant unit of energy consumed. This is in the confines of a smal l workshop. re-start without sputtering. These due to the higher heat of an electric features provide simple operation Maximum power requirements arc and the more efficient heat givin g reliable and repeatable are a 6kW, 3-phase supply which, transfer to the metal being sprayed, sprayed coatings. wil l give actual coverage of 770 ft 2 of compared with a combustion gas flame. Such coatings rebuild a worn QCM BULKHEAD QUICK-CONNECTS surfac e or will add required characteristics to a different base A new line of Swagelok miniature 360° swivel action, and is available material in production applications. quick-connect s for bulkhead in brass or 316 stainless steel with Sinc e virtually any metal is mounting where ⅛ in o.d . tubing is Swagelok ends. sprayable, the range of applications used in applications such as Buna O-Rings are standard in all is equally wide—from thin zinc vacuum and pressure systems, models . Pressure ratings are coatings on plastic panels to heavy coolant lines and control panels, 2000 ps i for brass and 4000 ps i for steel coatings to rebuild a badly has been added to the Manchester 316 stainless steel. Temperature worn steel mill roll. Valve & Fitting Company's range. ratings are 250°F wit h Buna O-Ring Coating characteristics are dif The new QCM Series Bulkhead and 450°F with Viton. ferent from those produced by other Quick-Connects provide a positive methods, making the electric arc leak-tight seal, with minimum dead Additiona l application areas process unique for some applica space. They require only push-pull include chromatographs, instru tions and suplementary to the range action of the fingertips for connect ment air, pollution equipment, of other Metco spray processes. In ing and disconnecting. The design gauges and many types of portable general, coatings are denser and in provides single-end shut off, allows equipment. INDUSTRIAL LUBRICATION AND TRIBOLOGY, September / October 1980 205
Industrial Lubrication and Tribology – Emerald Publishing
Published: May 1, 1980
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