. Canadian foundryman (1918). ompara-tively slow rate of de-posit by the metallicmethod makes for asmoother, more uni-form and better-look-ing weld, and hence isused in lighter service,such as general repairwork, etc. The tem-perature of the arcwith the metallic elec-trode is considerablyless than with the car-bon, and with care themetal need hardly beraised above the melt-ing point. Although the currentfor welding may betaken from any directcurrent system, provid-ing sufficient resist-ance be used to reducethe voltage to that re-quired at the arc, it iseconomical to use ajpccially-designed lo
. Canadian foundryman (1918). ompara-tively slow rate of de-posit by the metallicmethod makes for asmoother, more uni-form and better-look-ing weld, and hence isused in lighter service,such as general repairwork, etc. The tem-perature of the arcwith the metallic elec-trode is considerablyless than with the car-bon, and with care themetal need hardly beraised above the melt-ing point. Although the currentfor welding may betaken from any directcurrent system, provid-ing sufficient resist-ance be used to reducethe voltage to that re-quired at the arc, it iseconomical to use ajpccially-designed low voltage generator,independently driven. This is the systememployed at the plant described; thecompound wound generator has a capac-ity of 300 amperes at 60 volts, and iswound for constant voltage. The motor-generator set is mounted ira room separate from the welding sta-tion, which latter is shown in Fig. control equipment consists of a maingenerator panel, ammeter, volt melter,overload circuit breakers, field control. FIG. 3. -FLAT CUTTER WITH LONG WELDED TOOL STEELEDGE, FINISHING BEVEL GEAR BODIESIN TURRET LATHE. trie circuit; the article being welded ismade the positive terminal. The arc isformed by touching the work and quicklywithdrawing the electrode to a distanceof about 3/16 in. or less. The heat gen-erated by the arc melts the metal at thepoint of application, and the electrodeitself melts, furnishing the molten metalfor joining or building up the weldedparts. With the carbon electrode system acarbon pencil or rod is used for the electrode, and is made the negative terminalas with the metal electrode. The heatwhich can be obtained with the carbonelectrode is practically unlimited, and themetal can, therefore, be melted veryrapidly. In welding with the carbonelectrode the filling material must besupplied in the form of a separate rod orbar. The question might be asked: Do notcarbon particles enter the weld and causea very hard quality of iron at the joint?The lo
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