Equipment for welding

Equipment for welding

Equipment for Welding Equipment for Welding Introduction to Welding Circuit Current and Circuit Polarity Cables, Electrodes Arc welding power sources, DC and AC Power sources, Welding Positioners, Manipulators, Robotic Arms Automation in Welding Equipment for Welding Introduction to Welding Circuit Equipment for Welding Effect of Circuit Polarity Equipment for Welding Introduction and Classification of Power Sources for Welding Also known as Power Supplies and Welding machines Important Concepts 1. Duty Cycle Percentage of any given 10-minute period that machine can operate at rated current without overheating or breaking down Rating of 100% means machine can be used at rated amperage on continuous basis Required by continuous, automatic machine welding Rating of 60% means machine can be used at its capacity 6 out of every 10 minutes without damage Satisfactory for heavy SMAW and GTAW Equipment for Welding Introduction and Classification of Power Sources for Welding Also known as Power Supplies and Welding machines Important Concepts 2. Efficiency Relationship of secondary power output to primary power input Indicated in percent Determined by losses through machine when actually welding at rated current and voltage Average efficiencies Motor generator welding machines: 50% Transformer-rectifier: 70% Inverter: 85% Equipment for Welding Introduction and Classification of Power Sources for Welding Also known as Power Supplies and Welding machines Many different methods of classification Two Important Classifications 1. Power source type i. Rotating (Generator) ii. Static a. Transformer b. Transformer-rectifier c. Inverter 2. Output slope i. Constant Current CC- Also Referred to as Variable Voltage ii. Constant Voltage CV- Also Referred to as Variable Current Equipment for Welding Introduction and Classification of Power Sources for Welding Equipment for Welding Selection of Power Source Relative to Welding Process Because no single power source is right for all welding situations, it is necessary to know the processes to be used before selecting the best power source. Equipment for Welding Introduction and Classification of Power Sources for Welding Classification - Out Put Slope 2. Output slope i. Constant Current Current remains fairly constant regardless of changes in arc length. Called drooping voltage, variable voltage, or droppers Load voltage decreases as welding current increase. ii. Constant Voltage Voltage remains fairly constant regardless of changes in current. Equipment for Welding Introduction and Classification of Power Sources for Welding Classification - Out Put Slope [...]... have comfortable grip Size of holder must be in line with size of welding machine Fully insulated so stays cool even with high duty cycles Equipment for Welding Miscellaneous – SPRING TYPE ELECTRODE HOLDERS Equipment for Welding Miscellaneous – Turning Rolls Equipment for Welding Miscellaneous – Welding Positioner Equipment for Welding Miscellaneous – Seamers Equipment for Welding Miscellaneous – Welding. .. Sources for Welding Classification - Power source type ii Static (Converted Power) b Transformer- Rectifier Have many designs and purposes Flexibility is one reason for wide acceptance Deliver either DCEN or DCEP May be used for: Stick electrode welding Gas tungsten arc welding Submerged arc welding Multi-operator systems Stud welding Miller Electric Mfg Co The Lincoln Electric Co Equipment for Welding. .. Lincoln Electric Co Equipment for Welding Introduction and Classification of Power Sources for Welding Classification - Power source type ii Static (Converted Power) a Transformer Use basic electrical transformer to step down a.c line power voltage to a.c welding voltage b Transformer-rectifier Use basic electrical transformer to step down a.c line power voltage to a.c welding voltage Welding voltage then... voltage, variable voltage, or droppers Load Equipment for Welding Introduction and Classification of Power Sources for Welding Classification – Power Source Type 1 Generated (Rotating) i Motor Driven Equipment for Welding Introduction and Classification of Power Sources for Welding Classification – Power Source Type Motor Driven Generators Desirable Characteristics Have forceful penetrating arc Versatile -.. .Equipment for Welding Introduction and Classification of Power Sources for Welding Classification - Out Put Slope Equipment for Welding Introduction and Classification of Power Sources for Welding Classification – Power Source Type 1 Generated (Rotating) i Motor Driven Current remains fairly constant regardless of changes in arc length Called voltage decreases as welding current increase... output to d.c welding current May be either d.c or a.c.-d.c machines c Inverters Increases frequency of incoming primary power Constant current, constant voltage, or both Produce a.c or d.c welding current Equipment for Welding Introduction and Classification of Power Sources for Welding Classification - Power source type ii Static (Converted Power) a Transformer- AC Most popular a.c welding machine... Classification of Power Sources for Welding Classification - Power source type ii Static (Converted Power) b AC / DC Transformer- Rectifier Permit welder to select either a.c or d.c and electrode negative or electrode positive Switch Permits welder to use only transformer part of machine for a.c welding Flipping switch then output current directed through rectifier which converts it to d.c welding High frequency... controls, balance controls for a.c operation, remote control often built into machine The Lincoln Electric Co Equipment for Welding Introduction and Classification of Power Sources for Welding Classification - Power source type ii Static (Converted Power) b DC and AC/DC Inverters Portable, lightweight, and versatile May be either constant current, constant voltage or both Can perform several different... Function of transformer Step down high voltage of input current to high amperage, low voltage Especially suited for heavy work Reduces tendency to arc blow Can use larger electrodes resulting in faster speeds on heavy materials Lower cost Decreased power consumption High overall electrical efficiency Noiseless operation Reduced maintenance current required for welding Equipment for Welding Introduction... Greater the number of strands the more flexible Components A B Wires stranded for extra flexibility Paper wrapping around wires allows conductor to slip within robber covering when bent C Extra strength from open-braided reinforcement of extra cotton cords D Special composition and curing of heavy rubber covering Equipment for Welding Miscellaneous - ELECTRODE AND WORK CABLE WORK CABLE Not necessary to . sources, Welding Positioners, Manipulators, Robotic Arms Automation in Welding Equipment for Welding Introduction to Welding Circuit Equipment for Welding Effect. Current Equipment for Welding Introduction and Classification of Power Sources for Welding Equipment for Welding Selection of Power Source Relative to Welding