US1806128A - Process of coating arc welding electrodes - Google Patents

Description

y 1931- s. ,s. STEWART 1,806,128

PROCESS OF COATING ARC WELDING ELECTRODES Filed April 25, 1930 INVENTOR I v V ATTORNEYS 6 substances, have Patented May 19, 1931 I UNITED STATES PATENT OFFICE.

.SIGMUND S. STEWART, OF IPAS SAIC, NEW JERSEY, ASSIGNOB T0 WILSON WELDER l: METALS COMPANY, INC OF HOBOKEN, NEW JERSEY, A CORPORATION OF NEW YORK PROCESS O]? OOATIN 'G ABC WELDING ELECTRODES Application fled April 25,1930. Serial 110. 447,897.

This invention relates to ing arc welding electrodes.

Heretofore coatings, such for example as may be genericall termed weld-regulating een applied by dipping electrodes into the material and thereafter allowing the adhering material to dry on the electrodes while they are supported or held in a vertical or substantially vertical position.

Peculiar to the above prior practice are certain inherent disadvantages, among which the following are of a particular serious a process of coatnature: First, due to the consistency of the coating material, which is substantially that of a sticky mass, it will flow or move down the electrodes during drying with this result that the coating, when dry, will be substantially thicker atthe lower end of the electrodes than at the upper ends thereof, the

unevenness of such coatin tending to produce lack of uniformity in welding, as is well recognized by those skilled in the art.

Second, considerable time is required per unit weight of electrodes in carrying out the coating process according to the tice. Third, an excessive an amount of coating material for a given unit weight of electrodes has been necessary.

Fourth, the laborcost of coating, according to prior practice, has been high.

The ob ect of this invention is to overcome the above objections, and to this end the present method resides in tumbling the electrodes one upon another, in the presence of a coating material, while in a parallel or substantially parallel axial relation,and further contemplates a longitudinal shifting of the electrodes with respect to each other during the tumbling operation so as to produce a uniformly thick coating on each electrode throughout the length thereof; all of which results in a substantial saving, as compared -with prior labor cost.

Other objects and advantages of the invention will become apparent from the following description,'taken in connection with the accompanying drawing, which is a view in elevation showing a'tumbling apparatus practice, in time, material and (prior prac wasteful The tumbling apparatus herein shown includes a suitable rame 5, inthe vertical standards of which is 'ournalled a shaft 6,

to which is connecte a drive pulle 7 through which the shaft-may be rotated i i-om a suitable source of power, not shown, at a suitable speed, say, thirty revolutions per minute.

Secured to each end of the shaft 6, is a suitable receptacle or tumbling barrel 8 which is shown as hexagonal in cross section. These barrels are secured to the shaft 6 at a relatively small angle thereto, so that their contents will be subjected to-a shifting action longitudinally. of their axes while such contents is subjected to a rolling action in directions generally transversely of the barrels. For the coating of electrodes which are fourteen inches long, barrels each having a len h of twenty inches and a diameter of ten inc es have been found satisfactory in carrying out the present invention.- t

The outer end of eachbarrel is provided with a suitable closure, such as a dooi-YIO, which is held in closed position by a suitable fastener 11, the doors being so constructed as to enable them to be easily opened to permit the electrodes to be introduced into the barrels and removed therefrom.

According to this invention, the electrodes introducing the electrodes, together'with the coating material, into the barrels, the doors are closed and locked in'closedf positions,

whereupon the barrels are rotated about the axis of the shaft 6 with the result that the electrodes, which are'maintained in a substantial parallel relation durin vthe tumbling operation, are rolled one over t e other in the presence of the coating material and are at the same time subjected to longitudinal displacement, back and forth, with respect to Overt each other withoutv being disturbed in so far as parallelism with respect to each other is concerned.

The rolling action, to which the electrodes are sub'ected in the presence of the coating Y materia causes such material to adhere to the periphery of each electrode, and the lon-- gitudinal displacement of these electrodes during! the time that they are rolled one e other effects a uniform distribution thereon of the coating material, with the result that a coating of uniform thickness is 'ilpplifid, to each electrode throughout its en Y side from the fact that the processuembodying this invention results in a more uni form coating than has been obtained according. to prior practice, it has been found that upon completion of the coating operation the electrodes when removed from the tumbling barrels are in such a condition that they may be readily handled and packed for shipment; that the time required for carr ing out such coating operation is reduced mm eight hours, required according to prior practice, per unit electrode weight of 2,000 lbs. to a period of two hours, and that a saving of more than 71% in the cost of coating ma- 'terial alone is effected. v It will be understood that certain changes may be resorted to with regard to the process herein described and the apparatus employed in the carrying out of that process without departing from the spirit of the invention or $5 the scope of the following claim. What is claimed is: a

A process of coating arc welding electrodes with a frangible coating which consists in tumbling the electrodes one upon the other 40 in the resence of a coating material, while maintaming' the electrodes substantially parallel, and alternatelyinclining the electrodes in opposite directions during the tumbling,

whereby said electrodes are caused to shift 5 longitudinally over one another with a gentle sliding movement under the influence of gravity alone. 3

' In testimony whereof, I have afiixed my signature to this specification.

l0 'SIGMUND S. STEWART.

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