COMPUTER WELD TECHNOLOGY, INC.

1 COMPUTER weld technology , weld technology , Old Bammel N. Houston Texas, 77086 Phone 713-462-2118 Fax: 713-462-2503 Web: Leader in Automating, Controlling and Monitoring the Arc Welding mission at COMPUTER weld technology is to provide you with state-of-the-art products for automating, controlling and monitoring the welding process. General Product GroupsWeld Sequence ControllersWeld Monitoring SystemsAdaptive weld control systems using CWT patented Thru-Arc Seam Tracking TechnologyOEM Custom ControlsWeld Control ProductsWSC weld Sequence ControllerzWSC-1000, MWC, WSC II, UWCATC Automatic Torch ControllerzAVC or ACC torch height controlVSA Vertical Slide Assemblyz6 , 12 100 lb.

2 Stepper motor slide HSA Horizontal Slide Assemblyz3 , 6 , 12 45 lb. Stepper motor slideProduct LineupWeld Sequence Controller Configuration OptionsWSC-1000 weld sequence control in NEMA 4 rated enclosure with WRC-1000 remote modular weld control with integrated remote I/O module and optional DMC-500 motor Control System150 LINEPLC CONTROLLERRELAYSCR1-CR8 INPUTSINP1-INP8 DAC1-4 OUTPUTSANL1-2 INPUTSENCODERINPUTWRC-1000 WeldSequenceControlWELDPARAMETERSOSCILLA TIONPARAMETERSTORCHPARAMETERSSETUPPARAME TERSWELDPARAMETERSWIRE, TRAVEL,AMPS,VOLTSAND TRACKINGDATARS-232 TERMINALLANPORTRS-485 PENDANTWSC-1000 CONTROLKEYPADWeld Sequence Control EventsS1S2S3S4S5S6S7S8S10S11S9S1 = Cycle StartS1 - S2 = Event 1- Prepurge Gas Flow TimeS2 - S3 = Event 2- Arc Start Parameter TimeS3 - S4 = Event 3- Arc Active Delay TimeS4 - S5 = Event 4- Ramp Up TimeTimeS5 - S6 = Event 5- weld Time (spot or manual)

3 S6 - S7 = Event 6- Ramp Down TimeS7 - S8 = Event 7- Crater Fill Parameter TimeS8 - S 9 = Event 8- Wire Retract TimeS9 - S10 = Event 9- Burn Back TimeS10 - S11 = Event 10- Post Purge TimeTOFFTONP ulse EnabledWeld Sequence Control FeaturesProvides closed loop control for voltage and current values and will adjust the external welding devices to regulate and obtain the programmed values. Programmable control for arc voltage, arc current, wire feed speed, travel speed and event time. Setting the event time to zero will disable the specific event. In addition to the specific weld events the user can specify a pulse mode of control will pulse the arc voltage, arc current, wire feed speed and travel speed.

4 If an external oscillator (horizontal) axis is enabled, the user can synchronize the pulse mode to an oscillation pattern. The user can disable the pulsation of any single with WRC-1000 ControllerMotion Controllers DMC-500 and MSC IIMSC II Micro-Step controller is a microprocessor based stepper motor controller designed to operate 2 phase step Range amps per phase. zFull, Half and 10 step/step micro steps/second velocityDMC-500 DC motor speed control for DC motors up to Voltage - 0-90 VDCzField voltage 100 VDCVSA-2000/HSA-2000 SlidesVSA-2000 Series Vertical Slide Assembly. zLoad Capacity 100 lbs @ from Face of slidezStroke Length , , and zVelocity inch/seczResolution inchHSA-2000 series Horizontal Slide Capacity 35 lbs @ from Face of slidezStroke Length , , and zVelocity inch/seczResolution inchOperator Control PendantProvides User Jog and weld sequence control inputs as defined by system PLC pendant for weld process controlProvide Joy-Stick control of Torch weld Start.

5 Stop and jog functionsIncludes System ESTOP control for system shut downWF-100 Capstan FeederCompact Lightweight DesignPlastically Deforms WirePositive Wire Feed ForceEliminates Surface DamageSuitable for Cold and Hot WireMount on Robot Wrist Automated FixtureExceptional Feeding of Soft Wire (Alum).CWT Capstan WirefeederAdaptive Thru-Arc TrackingTechnology Overview COMPUTER weld technology Old Bammel N. Houston Texas, 77086 Phone 713-462-2118 Fax: 713-462-2503 Web: Tracking: The NeedPoor part fit up and part preparationReduce dependence on operator skillsLower cycle time and increase productivityImprove weld quality and consistency Reduce scrap partsSeam Tracking.

6 The TechnologyTactile probezMechanical probeOptical zLaserzVisionIR sensorsEddy currentRF proximity sensorsAcoustic emissionThrough-the-arc Through-the-arc Sensor TechnologyEvery arc offers impedance to the flow of impedance is inversely proportional to density of the charge carriers and their column impedances are calculable as a function of impedance depends on radial and axial disturbances of carrier Torch Height ControlMelting rate fixed by wire speed and wire density set by wire rate equation can be used to determine electrode = (IREF IACT)/(IREF) * 100 * zL = change in electrode extensionzIREF= reference currentzIACT= actual currentz = percent current change per wire length, for mm dia steel electrode = mm/%IThru-Arc Centerline ControlFor center position correction vector the torch must be oscillatedSamples taken at center and A/B sidewall positionsCVEC= (ASM BSM) * zCSM = center correction vectorzASM = A side samplezBSM = B side samplez = constant of proportionality for center correction vectorA=B Tracking ImplementationMotion controller must provide the following.

7 ZA and B position timingzAbility to change center position of weave patternzTorch height correction perpendicular to weave patternzWeave pattern must be consistent within working envelopeMethod used in most robotic implementationsSimple retrofit to existing hard tooled fixturesA=B Tracking ApplicationsA=B is used with most robotic balanced joint geometry or bias for single pass heavy for fillet, lap, v-groove joint to use with single side wall Width ControlUse impedance to determine arc center sample and percent penetration value to establish integrationHalt torch motion when value is new width, center position and cross seam correction last center sample to generate torch height correction Fill Height ControlUse wire speed, travel speed and starting width to calculate volume new width and fill height to generate new max/min heat input to control adaptive fill torch height to extend adaptive fill limits at max/min heat Adaptive Procedure ControlBased on initial width.

8 Weave speed, dwell time, wire speed, volt and amps calculate work function for center and sidewall center work and new width and travel speed to control weave sidewall work and travel speed to adjust dwell impedance profile to control bead Tracking ImplementationMotion controller must provide the following:zContinuous torch position informationzAbility to change center position and amplitude of weave patternzTorch height correction perpendicular to weave patternzWeave pattern must be consistence within working envelopezAdjustable weave and travel speed during weldingzProvide weld schedule data for reference and controlMethod has been integrated to robotic controllersRetrofit to existing hard tooled fixtures using dedicated weld system controllerAdaptive Tracking ApplicationsTechnology adapted to advanced robotic controllersProvides single side and adjustable width controlGood for single and multiple

9 Pass heavy weldmentsRequires minimum of 2 wire diameters joint definition for all weld processUsed for fillet, lap and v-groove joint geometryCan be used with GMAW, SAW, PAW, GTAW welding processesThru-Arc technology SummaryBenefits:No additional sensorsMaintains true arc positionProvides adaptive fill capabilitiesSimple retrofit to existing fixturesNo special maintenance requirementsLimitations:Minimum oscillation of one wire diameterRequires stable arc processChanges in weld procedure must be made by controllerMax travel speed 40 50 ipm2 wire diameter joint definitionCenterline Thru-Arc Tracking ModeTarget is to maintain the same impedance on both sides of the weaveDefinable torch to work (stick-out)

10 As height referenceA bias can be applied to the impedance measurement to adjust position of the weld in the jointRobotic Application using Center Line Tracking ModeSingle Side Thru-Arc Tracking ModeAllows user to set side-wall penetration as percent of stick-out length changeUses torch-to-work (stick-out) as referenceApplication:zLap jointszMulti-layer passeszJoints where one side is unevenRobotic Application Using Single Side Tracking ModeVariable Width Tracking with Constant Fill Height ModeUses torch-to-work (stick-out) as referenceAllows user to set side-wall penetration as percent of stick-out length changeAutomatic variable weave width Variable welding speed based on weave widthForward travel speed is adjusted to maintain a constant volume fill height Variable Width Tracking Mode With 50% Volume Change Three Pass single bevel using constant volume fill Three pass V-groove using constant volume fillFixed Automation Thru-Arc System ComponentsWeld Sequence Controller with Thru-Arc tracking and adaptive weld process Slides for torch Slide motor controllers for wire drive and travel supplied power source