stt 焊接工艺培训

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1、1STTSurfaceTensionTransferNovember2008表面张力过渡技术MichaelHuApplicationandProductDevelopmentManagerofAutomationDivisionofShanghaiLincolnElectric2Basics基本概念S.T.T.=SurfaceTensionTransfer表面张力过渡ResearchBeganJuly19851985年开始研究开发Purposeistodevelopaweldingprocesswhicheliminatessp

2、atterwhenuse100%CO2shieldinggas目的是为了开发一种使用CO2保护气体而没有飞溅的焊接方法STTisaUniqueGMAWProcess一种独特的气保护焊接工艺3Basics基本概念NeitherCCNorCV既不是恒流源也不是恒压源BasedoninteractiveWAVEFORMCONTROLTECHNOLOGYTM基于交互式波形控制技术BasedonHighSpeedInverterTechnology基于高速逆变技术PrecisionCurrentControlledShortArc精密电流控

3、制的短路过渡焊接4Advantages优点Lowspatter低飞溅量Lowfume低烟尘LowcostGas低气体成本ControlledHeatInput可控制的热输入量AllPosition可进行全位置焊接GoodFusion良好的焊接成型HandlesPoorFit-up适用较差的接头形式5ManualWelding:STTvsShortArc手工焊接:表面张力过渡vs短路过渡StandardGMAW标准的气保护焊接SurfaceTensionTransfer表面张力过渡6TraditionalGMAW传统气保护焊接7ST

4、TWelding表面张力过渡焊接8StandardGMAW标准的气保护焊接SurfaceTensionTransfer表面张力过渡RoboticsWelding:STTvsShortArc机器人焊接:表面张力过渡vs短路过渡9G.M.A.W=GasMetalArcWelding熔化极气体保护焊接MIG/MAGWeldingMIG/MAG焊接MIG=MetalInertGas惰性气体熔化极保护焊MAG=MetalActiveGas活性气体熔化极保护焊SolidWirewithExternalShieldingGas实芯焊丝和外部保护

5、气体DC+Polarity直流正接WhatisGMAW?什么是GMAW?10OverviewofGMAWprocesses气保护焊接工艺概述ConsistentVoltageGMAW(CV)恒压气保护焊接PulseGMAW(MIG/MAG)脉冲气保护焊接STT(SurfaceTensionTransfer)表面张力气保护焊接11CVPowerSourceOutput恒压电源输出WeldingCircuitConsistsofCVPowerSourceswithaWireFeeder焊接回路由恒压电源和送丝机组成VoltageisP

6、roportionaltoArcLength电压与电弧长度成正比CurrentChangesDramaticallytoMaintainConstantArcLength电流动态变化以维持恒定的电弧长度12ModesofArcTransfer熔滴过渡形式ShortCircuit(ShortArc)Transfer短路过渡GlobularTransfer滴状过渡SprayTransfer喷射过渡Conventional常规形式WaveformControlTechnologyTM波形控制技术PulseSprayTransfer脉冲喷

7、射过渡SurfaceTensionTransfer表面张力过渡13ShortArcTransfer短路过渡LowVoltages&LowAmperages低电压&低电流TypicallySmallerWireDiameters典型的小直径焊丝TypicalShieldingGasesIncludeCO2,75/25Ar/CO2典型保护气体100%CO2,72/25Ar/CO2TheWireShortstoWorkpiece.焊丝与工件短路TheVoltage=0电压为零TheAmperageAcceleratesRapidly电流

8、快速增加WireBreaksoffProducingaWeldBeadandSpatter焊丝断开产生焊缝和飞溅14ShortArcTransfer短路过渡15LowHeatInput低热输入AllPositionWelding全位置焊接LowCo