b'Internal Welding MachineProven Technology master control box located on the nose cone. Thelightweight tubular Reach Rod contains the controlThe CRC-Evans Internal Welding Machine (IWM) cable, all welding leads, air line, gas charge hose,isacombinationinternalclampandautomatic and battery charge cable.multi head internal root pass welding system. Thismachine is available in two variations; one for barge The welding heads are located symmetrically aroundor offshore applications and one for land or standard the rotating ring and perform the root pass weldingpipeline right of way. from the inside. The number of welding heads on theIWM varies between four and eight depending on theAselfcontainedlowvoltageelectricalsource machines size (most machines have six or eight).providespowerfortheshieldinggas,aircontrolvalves,ringdriveandwirefeedmotors.The The CRC-Evans IWM is the most productive systempneumatic system, also self contained, operates the for pipeline root pass welding. On a 36 pipeline, thetravelmotors,brakes,drivewheels,aligners,and root pass welding arc time less than one minute. Thefront and rear clamping shoes. Manipulation of the internal root pass technique is also more tolerable tointernal welder is controlled by an operator at the end pipe mismatch (high/low) than any other external rootof a 40/80 Reach Rod by a control box or by the pass technique.Internal Welding MachineFeatures Benefits Multi-welding headsHigh production ratesNo root gapQuick accurate alignment Fully automatic weldingNo copper contamination Internal root passMore tolerance to high/lowCRC-Evans Pipeline Equipment77'