Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
testing of resistance weldsthere are a number of destructive and non destructive tests available for testing the welds obtained by resistance welding
transformer for flash butt weldingthe transformer required for flash butt welding is similar to that needed for other resistance welding processes
basic elements of flashbutt weldinga flash butt welding machine is mainly comprised of amain framestationary platenmoving platenclamping
upset butt welding machinesthese are usually small capacity horizontal type machines the power source required for these is a step down transformer
resistance welding electrodes and holdersrequisites for electrodes the resistance welding electrodes are meant for the following functionsconducting
driving mechanism i knurl or friction drive this has either the upper or lower electrode or both driven by a friction wheel on the periphery
intermittent motionmost seam welding machine requirements are met by the use of continuous drive however in cases where heavy work parts are to be
constituents of seam weldingthe essential elements of a seam welding machine aremain frame containing welding transformer and tap switchwelding head
spot and projection welding machineson the basis of the mechanical construction resistance spot welding machines can be of four types viz rocker arm
characteristics of the secondary circuitthe dimensions of the secondary circuit in secondary loop determine to a large extent the performance of
tap switchesthere are elements for connecting the various taps on the primary winding of the transformer to the power supply line the switches are
duty cyclethe concept of duty cycle is to be clearly understood before operating any machine unlike the arc welding power sources the resistance
welding transformerthe resistance welding transformers step down the line tune of 2 to 20 v the primary is connected to the line supply and is made
equipment for resistance welding-protectiona circuit breaker can be provided this equipment can be rated for interrupted capacity which will cater to
equipment for resistance welding-measurementsmeasurement of the parameters are important while fixing the parameters or testing a machine resistance
controls for resistance welding machinesthe main controls required for a resistance welding machine arei initiation and termination of the currentii
equipment for resistance welding-stored energy equipments energy can be stored and further utilised for weldingone method of storing energy is in
equipment for resistance weldingthe equipment for resistance welding is different from that for arc welding for the following reasons resistance
effect of parameters in flash butt weldingflashing feed rate if excessive there is a probability of the parts freezing together without welding if
advantage of flash butt welding1 higher weld strength2 higher production rate3 better heat concentration4 simple weld surface preparation5 wide range
flash butt welding-flashingthe phenomenon of flashing is of extreme importance in achieving satisfactory welds flashing can begin only after a molten
flash butt weldingthe two pieces to be welded are pressed against each other by applying a pressure to whatever finish the faces are machined there
projection weldingprojection welding is similar to spot welding but for the fact that the welding takes place at the projections on the surface of
applications of seam weldinglap seam welding is used for the manufacture of cans buckets and water tanks and for welding thin walled large diameter
seam welding-selection of parametersthe selection of parameters for seam welding depends mainly onweld nugget size which is related to weld