• Typical Shielding Gases Include CO2 , 75/25 Ar/CO2 典型保护气体 100%CO2, 72/25 Ar/CO2
• The Wire Shorts to Workpiece. 焊丝与工件短路
• The Voltage = 0 电压为零
• The Amperage Accelerates Rapidly 电流快速增加
• Pulse Spray Transfer 脉冲喷射过渡 •Surface Tension Transfer 表面张力过渡
MM-3
12
Short Arc Transfer 短路过渡
• Low Voltages & Low Amperages 低电压&低电流
• Typically Smaller Wire Diameters 典型的小直径焊丝
MM-3
7
Robotics Welding: STT vs Short Arc
机器人焊接: 表面张力过渡 vs 短路过渡
Standard GMAW 标准的气保护焊接
MM-3
Surface Tension Transfer 表面张力过渡
8
What is GMAW? 什么是GMAW?
• G.M.A.W = Gas Metal Arc Welding
• DC+ Polarity 直流正接
MM-3
9
Overview of GMAW processes 气保护焊接工艺概述
•Consistent Voltage GMAW (CV)
恒压气保护焊接
•Pulse GMAW (MIG/MAG)
脉冲气保护焊接
•STT (Surface Tension Transfer)
STT Surface Tension Transfer
November 2008
表面张力过渡技术
Michael Hu Application and Product Development
Manager of Automation Division of Shanghai Lincoln Electric
• Current Changes Dramatically to Maintain Constant Arc Length 电流动态变化以维持恒定的电弧长度
MM-3
11
Modes of Arc Transfer 熔滴过渡形式 Conventional 常规形式 • Short Circuit (Short Arc) Transfer 短路过渡 • Globular Transfer 滴状过渡 • Spray Transfer 喷射过渡 Waveform Control Technology TM波形控制技术
熔化极气体保护焊接
• MIG/MAG Welding MIG/MAG 焊接
- MIG = Metal Inert Gas 惰性气体熔化极保护焊 - MAG= Metal Active Gas 活性气体熔化极保护焊
• Solid Wire with External Shielding Gas
实芯焊丝和外部保护气体
MM-3
4
Manual Welding: STT vs Short Arc
手工焊接: 表面张力过渡 vs 短路过渡
Surface Tension Transfer 表面张力过渡
MM-3
Standard GMAW 标准的气保护焊接
5
Traditional GMAW 传统 气保护焊接
MM-3
6
STT Welding 表面张力过渡焊接
• Wire Breaks off Producing a Weld Bead and Spatter 焊丝断开产生焊缝和飞溅
MM-3
13
Short Arc Transfer 短路过渡
MM-3
14
Short Arc Transfer 短路过渡
Advantages优点
Limitations 缺点
• Low Heat Input
• 基于交互式波形控制技术
• Based on High Speed Inverter Technology
• 基于高速逆变技术
• Precision Current Controlled Short Arc
• 精密电流控制的短路过渡焊接
MM-3
3
Advantages 优点
1. Low spatter 低飞溅量 2. Low fume 低烟尘 3. Low cost Gas 低气体成本 4. Controlled Heat Input 可控制的热输入量 5. All Position 可进行全位置焊接 6. Good Fusion 良好的焊接成型 7. Handles Poor Fit-up 适用较差的接头形式
表面张力气保护焊接
MM-3
10
CV Power Source Output 恒压电源输出
• Welding Circuit Consists of CV Power Sources with a Wire Feeder 焊接回路由恒压电源和送丝机组成
• Voltage is Proportional to Arc Length 电压与电弧长度成正比
• 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
• STT is a Unique GMAW Process
• 一种独特的气保护焊接工艺
MM-3
2
Basics 基本概念
• Neither CC Nor CV
• 既不是恒流源也不是恒压源
• Based on interactive WAVEFORM CONTROL TECHNOLOGYTM
MM-3
1
Basics 基本概念
• S.T.T. = Surface Tension Transfer
• 表面张力过渡
• Research Began July 1985
• 1985年开始研究开发
• Purpose is to dev Nhomakorabealop a welding process which eliminates spatter when use 100% CO2 shielding gas
低热输入
• All Position Welding
全位置焊接
• Low Cost
低成本
• Poor Fit Up