Document 7EJDODebD7py88B7dj22Km6V

More PLANT PROBLEM! BALANCE THE LOAD when more then one welder Is hooked into * circuit With two dc sets on the tame line, one set up (or etroight polarity work and the other for reverse (holder positive), you run into a 160-v circuit if maximum allowable open-circuit voltage (or each machine i* 80 v. You complete this cir cuit when you contact uninsulated parte of the eleotrode terminals, cables or holders. ' Aff should check his welding circuit, especially rods and balden to see if there are about that may be causing Ms overheating. That's where he may find trouble source. T Ln Mack Chicago, III. AWS ReeoBmiiibta for BSOIO EWOII Bsais BtOlt BSOIJ BASSO smo a i * a. a CONTROL VOlTAOt with setting on ma chine. Use high voltage hut tow current on thin metals so arc won't burn through metal. High current will bo needed on an overhead job to get enough penetration with sufficient are force to help push the metal Up. Use a high cur*, a casting; voltage msy be Choose electrode eorreal'L gives American Walding Seem/ mendatiene for electrodes Ing plain-carbon ateel. *35! Bun Masepoale ` WBONO ELECTRODES for current values being used may cause MT trouble. Check ciuren! recommendation of rod manufacturer to sea If ;{i is within the range used. Too high d^urrent setting may overheat the rods. John Bcmniwc New York, N. Y, CHECK POLARITY of welding current to make sure it Is right for rods used. Electrode negative is best /or bore or lightly coated electrodes because a lit* tie more beat is generated on positive side of circuit with this type. Adding a coating to the electrode forms gas in the arc, which alter* heat conditions so greater heat Is produced on the negative aide. But remember, heat conditions are effected differently by various coatings. One heavy coating may give desirable heat conditions with electrode negative, while another coating on same elec trode may have a more desirable heat balance with electrode positive. Designer decides polarity to use with any electrode. If MT is in doubt about polarity to use with any electrode he can cheek the melt-off rate. Melt off 6 or 8 in. of on electrode with each polar* ity, keeping a record ol the time needed. Longer melt-off time usually gives greater heat in plate or joint. Such a test is accurate enough for most jobs. L C Kami Denper, Colo. Whal Causes This Wafer Hammer? HERE ARE THE FACl'Si Every time Ruth valves in our sanitary; line* are opened we gel a sharp knoek in ihe pipes, sketch p HI? Dee Power. We've tried suppressor* a| point* shown but thosi^ wasn't reduced. Hammer isn't common'type from sudden hatting |j liquid flow. Instead, It is a reverse shock opposite to flow rilretlfoiifj It mokes pipe move about K In. Shock seems to be independent of flow, end there ere no thwft wove* following the Initial one. Reducing flow at flush valves cats! shock somewhat, but not completely. All pipes are clean, wllhatd] internal obstructions. Jm What's best way of stopping these shock*? Do we need reore'er larger suppressors? Should we change piping?--C/I, Dee ftnasr/ Here Are the Answers. Ah thgmOf yin. dig o/ot IXCISUVE CURRENT overheats any elec trical device, including welding rodsIt can also cause major damage to welder, especially if there is no over load protection. Don't use weldor while defect exists. Cheek current settings on dial pointer with an ammeter temporarily hooked to the welding line. L E PouKnrr Brooklyn, N. Y. SMALL AIR CHAMBER WATER HAMMER in C//'s sanitary lines comas from intermittent stoppage of flow through the flush valves. Decreased flow reduces shock in the piping. Water hammer is a series of pressure pulsation* above end below normal pressure in line. Pulsation# *1**533 the moving fluid Is suddenly >?r" Noise wc hear come* from Several ways ol relieving MlM/E sure accompanying water hammer (I) spring-loaded relief valves tk* 134 PLANT OPERATION AND MAINTENANCE SECTION PUNT DE-MOTHBALLED FAST THE HELP OF TWO SUN PRODUCTS Recently the U. S. Hoffman Machinery Corporation was asked to reopen a World War 11 Navy-owned shell-making plant and start production in three months. The machinery, idle Tor 5 years, hod been Protected by an external Inver of rust preventive. Headslocks, gear units ami hydraulic lines were among the parts coated, and unfortunaiely some of the protective material had seeped into them, ll . looked as if the machinery might hove to be lorn down to bo cleaned. Hoffman invited Sun nnd Severn! other oil com panies to survey the machinery and suggest cleaning methods. The company chose Sun's recommenda tions on the basis of their soundness, as well as on Sun's record (or reliable service in other Hoffman flams. The Sun products used eliminated the need or any dismantling. Sun Spirits did the external cleaning job. Sunvts H.D. 700 Oils frect) up /he hydraulic systems, many of which were extremely sluggish; the detergency of these nils flushed away - every last trace of sludge and rust preventive. Throughout the entire cleaning and recharging process, Sun representalivcs stayed oh the job. As pari of Sun'a regular service, they trained the oilers, helped work out an inventory coni rot system, and set up lubrication schedules. The terms of the Novy contract were met, and vital defense production was started on schedule. In the year and a half that has -since elapsed, there have been no machine failures traceable to poor lubrication. .'"tdown wss needed. Sun Spirits did the Wj.cJesnift* job and the detergency of Sunvis H.D. 700 ^? tll!*rr|AMQb--leaning out part* and freeing hydraulic ^_Jh*nkj to the effectiveness of these product*, the ,CH' the plant put in operating condition ' 66 >Pec'h*d by the Navy. SUN OIL COMPANY. Dept. P-3 Philadelphia 9, Pa., Q I would like to consult with a Sun representative. Q Pleosetend me o copy of ''Sunvis H.0.700 Oili." -- ------- Tide---------------------------------------------------------------------Company. Address-- City. _State_ TCCHNICAL ASSISTANCE AVAILABLE. Sun'* ngi- neers are at your service for coniultotion on any matters concerning hydraulics, lubrication or metalworking. It will pay you to utilize the brood experience they hove gained i-->pnuro-bisa-loeiv.ml,iv'.tis.xnpgin amm fatwnnviydeidlinifvfVearrreeienntltyiInnoddufusslturtribeiers*i.c. ating and processing SUN INDUSTRIAL PRODUCTS *" a COMMIIY, PHIUOaCHU 1, M. . IKK 01 COW/WT, IfO. MtmO 4M UMTStM