پاورپوینت کامل درمانگاه تخصصی و جوشکاری ۱۱۹ اسلاید در PowerPoint

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 پاورپوینت کامل درمانگاه تخصصی و جوشکاری ۱۱۹ اسلاید در PowerPoint دارای ۱۱۹ اسلاید می باشد و دارای تنظیمات کامل در PowerPoint می باشد و آماده ارائه یا چاپ است

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پاورپوینت کامل درمانگاه تخصصی و جوشکاری ۱۱۹ اسلاید در PowerPoint

اسلاید ۴: Rivetsa) Solidb) Tubularc) Split (bifurcated)d) compressionIntroduction: 1. Mechanical Joining Processes

اسلاید ۵: Design guidelines for riveting(a) Exposed shank is too long; the result is buckling instead of upsetting(b) Rivets should be placed sufficiently far from edges to avoid stress concentrationsIntroduction: 1. Mechanical Joining Processes

اسلاید ۶: Design guidelines for riveting(c)Joined sections should allow ample clearance for riveting tools(d) section curvature should not interfere with the riveting processIntroduction: 1. Mechanical Joining Processes

اسلاید ۷: Adhesive BondingProducts are joined and assembled by the use of AdhesivesAdhesives properties to be consideredStrengthToughnessResistance to various fluidsAbility to wet the surface to be bondedIntroduction: 2. Chemical Joining Processes

اسلاید ۸: Types of adhesivesIntroduction: 2. Chemical Joining ProcessesProperty

اسلاید ۹: Adhesive Peeling TestCharacteristic behavior of adhesive in a peeling test :(a) brittle adhesive (b) tough adhesiveIntroduction: 2. Chemical Joining ProcessesPeeling Force(a)(b)

اسلاید ۱۰: Joint Design in Adhesive BondingIntroduction: 2. Chemical Joining ProcessesAdhesiveAdhesiveAdhesiveRivetSpot Welda. Poorb. Goodc. Very Goodd. Combination Joints

اسلاید ۱۱: Configurations for adhesive bonds(a) Single lap(b) Double lapIntroduction: 2. Chemical Joining Processes

اسلاید ۱۲: Configurations for adhesive bonds(c) Scarf (d) StrapIntroduction: 2. Chemical Joining Processes

اسلاید ۱۳: Introduction: 3. Metallurgical Joining ProcessesJoiningSolid state weldingSoldering and brazingFusion weldingArc energy Chemical energyOther processes Non consumable electrode Consumable electrode Resistance welding Cold weldingFriction welding Diffusion weldingFlash weldingUltrasonic weldingExplosion weldingGas metal arc welding Shielded metal arc weldingSubmerged arc weldingFlux cored arc welding Electrogas weldingElectroslag welding Gas tungsten arc weldingAtomic hydrogen welding Plasma arc weldingOxyacetylene welding Oxyfuel gas weldingLaser beam weldingThermit weldingElectron beam welding…SolderingBrazing

اسلاید ۱۴: Introduction: Arc Welding ProcessesElectric arc welding refers to a group of fusion welding processes that use an electric arc to produce the heat required for melting the metal.Advantages:Inexpensive power sourceRelatively inexpensive equipmentWelders use standard domestic current.Portable equipment is availableProcess is fast and reliableShort learning curveEquipment can be used for multiple functionsElectric arc heat is about 5,000 oC

اسلاید ۱۵: All fusion welding process have thee requirements:HeatShieldingFiller metalThe method used to meet these three requirements is the difference between arc welding processes.In this class you will have the opportunity to use four arc welding processes:SMAWGMAWGTAWSAWIntroduction: Arc Welding Processes

اسلاید ۱۶: Additional Electric Arc Welding Processes FCAW (Flux Core Arc Welding) ESW (Electroslag Welding) EGW (Electrogas Welding) PAW (Plasma Arc Welding) ASW (Arc Stud Welding)

اسلاید ۱۷: Safe PracticesProtection from :Arc’s raysWelding fumesSparksContact with hot metal

اسلاید ۱۸: Arc Welding Power SuppliesThe current for arc welder can be supplied by line current or an alternator/generator.Line current must be transformed:High voltage–Low amperage High amperage–low voltageThe type of and polarity of the welding current is one of the differences between the different arc welding processes.SMAWConstant current (CC), AC, DC+ or DC-GMAWConstant voltage (CV) DC+ or DC-GTAWConstant Current (CC) ), AC, DC+ or DC-Welding current differences can include: AmperageVoltagePolarityHigh frequency currentWave form

اسلاید ۱۹: Considerations When Selecting an Arc Welding Power SupplyMaximum AmperageDuty cycleAmperage rangeAmperage adjustment mechanismInput power requirementsInitial cost and operating costSize and portabilityFuture needs for a power supplyAvailable skillsSafetyManufacturers supportOpen circuit voltage

اسلاید ۲۰: Arc Welding Requirements

اسلاید ۲۱: Amperage Output & Duty cycleOptimum output amperage is determined by:thickness of the metal,type of joint,welding positiontype of electrode.The amount of continuous welding time a power supply can be used is determined by the duty cycle of the power supply.Duty cycle is based on a 10 minute interval.Many power supplies have a sloping duty cycle.

اسلاید ۲۲: Five Common Output Currents1. AC2. DC3. ACHF4. PC5. Square wave(Alternating Current)(Direct Current)(Alternating Current-High Frequency)(Pulsed Current)

اسلاید ۲۳: Addition Features Available on Some Electric Arc Power Supplies:1. Remote control2. High frequency3. Wave balancing4. Voltage control

اسلاید ۲۴: Electric Arc Welding Electrical TermsElectrical CircuitDirect current (DC)Alternating current (AC)AmpereVoltResistanceOhms LawConstant potentialConstant currentVoltage dropOpen circuit voltageArc voltagePolarityDual Control

اسلاید ۲۵: Electrical CircuitAn electrical circuit is a complete path for electricity.When the arc is established, an electrical circuit is also completed.

اسلاید ۲۶: Alternating CurrentThe type of current where the flow of electrons reverses direction (polarity) at regular intervals.Recommended current for general purpose electrodes and flat position.

اسلاید ۲۷: Direct CurrentThe type of current where the flow of electrons (polarity) is in one direction.Controlling the polarity allows the welder to influence the location of the heat.When the electrode is positive (+) DCRP or DCEP it will be slightly hotter than the base metal.When the base metal is positive (+), DCSP or DCEN, the base metal will be slightly hotter than the electrode.DC current is required for some electrodes and recommended for out of position welding.

اسلاید ۲۸: AmpereAmperes: the unit of measure for current flow.One ampere is equal to 6.24158 electrons passing by a point per second.Electricity passing through a resistance causes heat.An air gap is a high resistanceThe greater the amperage flowing through the resistance (air gap)–the greater the heat.The electrode also has resistance.Excessive amperage for the diameter of the electrode over heats the electrode. Insufficient amperage for the diameter of electrode makes electrode hard to start.

اسلاید ۲۹: VoltThe volt is the measure of electromotive force.It is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power.The voltage at the electrode determines the harshness of the arc.Voltage is only adjustable in dual control machines.

اسلاید ۳۰: ResistanceThat characteristic of a material that impedes the flow of an electrical current.Measured in units of Ohm’s ( )When ever an electrical current passes through a resistance heat is produced.Air is a high resistanceElectrical current passing through air produces a lot of heat.

اسلاید ۳۱: Ohm’s LawOhms law states that, in an electrical circuit, the current passing through a material is directly proportional to the potential difference applied acromonly expressed as:E=I.RCan also be used to teach electrical safety.Amperage is the harmful portion of electrical current.Rearranging Ohm’s Law for amperage shows that amperage (current flow) is determined by the voltage divided by the resistance:I=E/RThe higher the resistance, the less current that will flow for a given voltage.

اسلاید ۳۲: Power SupplyThere are 2 different types of power supplies: Constant current Constant potential In a constant current power supply, the current (amperage) stays relatively constant when the voltage is changed.In a constant potential power supply, the voltage stays relatively constant when the amperage is changed.

اسلاید ۳۳: Constant Current Power SupplyCharacteristics of constant current power supply:The machine provides a high voltage for striking the arc.Open circuit voltage (OCV)OCV is not adjustable for most machinesWhen the arc is struck the voltage drops to the welding voltage.Arc voltageArc voltage varies with the arc length.As the welding proceeds the current will not vary much as the arc length changes.

اسلاید ۳۴: Increasing the voltage from 20 to 25 volts (25%) only decreases the amperage from 113 to 120 Amp (5.8%).Constant Current Power Supply-Cont.

اسلاید ۳۵: Constant Potential Power Supply