We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byKarissa Coleman
Modified over 2 years ago
© 2012 Delmar, Cengage Learning Chapter 30 Oxyfuel Welding and Cutting Equipment, Setup, and Operation
© 2012 Delmar, Cengage Learning Objectives Describe how to maintain the major components of oxyfuel welding equipment Explain the method of testing an oxyfuel system for leaks Demonstrate how to set up, light, adjust, extinguish, and disassemble oxyfuel welding equipment safely
© 2012 Delmar, Cengage Learning Introduction Oxyfuel welding, cutting, brazing, hardsurfacing, heating, etc. –Use the same basic equipment Cylinders Regulators Hoses Hose fittings Safety valves Torches Tips
© 2012 Delmar, Cengage Learning Introduction (cont'd.) All oxyfuel processes use a high-heat, high- temperature flame –Produced by burning a fuel gas mixed with pure oxygen –Gases are supplied in pressurized cylinders –Regulators reduce gas pressure from the cylinder –Gas flows through flexible hoses Torch controls flow –Acetylene is the most widely used fuel gas
© 2012 Delmar, Cengage Learning Pressure Regulators Reduce a high pressure to a lower working pressure –Kept constant over a range of flow rates Various types –Low-pressure regulators, high-pressure regulators, single-stage regulators, dual-stage regulators, cylinder regulators, etc. Not interchangeable
© 2012 Delmar, Cengage Learning Regulator Operation Regulators work by holding the forces on both sides of a diaphragm in balance –Gas pressure on back side of diaphragm is reduced Two-stage regulators –Keep pressure constant at very low or high flow rates –Two sets of springs, diaphragms, and valves
© 2012 Delmar, Cengage Learning FIGURE 30-1 Force applied to the flexible diaphragm by the adjusting screw through the spring opens the high-pressure valve. © Cengage Learning 2012
© 2012 Delmar, Cengage Learning Regulator Gauges One or two gauges on a regulator –One regulator gauge shows working pressure Shows pressure at regulator and not at the torch –Second gauge shows cylinder pressure Line drop –Caused by resistance of a gas flow
© 2012 Delmar, Cengage Learning Regulator Safety Pressure Release Device Safety release valve or safety disc –Prevent excessive pressure from damaging the regulator Safety release valve –Made of a ball held against a seat by a spring Safety disc –Thin piece of metal held between two seals Must be replaced if used
© 2012 Delmar, Cengage Learning Cylinder and Regulator Fittings Ensure regulator is not connected to wrong gas or pressure –Common adapters Left-hand male acetylene cylinder fitting to a right- hand female regulator fitting Argon or mixed gas male to a female flat washer- type CO 2 fitting –Considerations Keep fittings free of dirt and oil Screw together freely by hand Replace damaged connections
© 2012 Delmar, Cengage Learning Regulator Safety Precautions Key points –Back off adjusting screw at shut down to prevent damage –Creep is rising pressure on working side of regulator –If leakage at the seat is severe: maximum safe pressure can be exceeded on working side Results in damage to diaphragm, gauge, hoses, etc. –Do not use regulators that creep excessively
© 2012 Delmar, Cengage Learning Regulator Care and Use Considerations –No internal or external moving parts on a regulator or a gauge require oiling –Adjusting screw becomes tight and difficult to turn: remove and clean with a dry, oil-free rag –Replacing adjusting screw: be sure it does not become cross-threaded –Welding is finished and cylinders are turned off: gas pressure must be released and adjusting screw backed out
© 2012 Delmar, Cengage Learning Welding and Cutting Torches: Design and Service Oxyacetylene hand torches –Most common type of oxyfuel gas torch used Combination welding and cutting torches –More flexible Straight or dedicated cutting torches –Longer than combination torches Most manufacturers make torches in a variety of sizes for different types of work
© 2012 Delmar, Cengage Learning Mixing the Gases Two methods for mixing oxygen and fuel gas –Two gases mixed completely before leaving tip One method uses equal pressures –Gases are mixed in a mixing chamber Second method uses higher oxygen pressure –Gases are mixed in an injector chamber
© 2012 Delmar, Cengage Learning FIGURE Schematic drawing of an oxyacetylene welding torch. © Cengage Learning 2012
© 2012 Delmar, Cengage Learning Torch Care and Use Considerations –Torch body contains threaded connections for the hoses and tips –Wrench should never be used on one nut unless the other connection is protected –Hose connections should not leak after they are tightened –Valves should be easily turned on and off –Bubbles around the valve stem indicates a leaking valve packing
© 2012 Delmar, Cengage Learning FIGURE One hose-fitting nut will protect the threads when the other nut is loosened or tightened. Larry Jeffus.
© 2012 Delmar, Cengage Learning Welding and Heating Torch Tips Key points –No industrial standard tip size identification system Students must learn various tip sizes –Tip sizes: comparable to numbered drill sizes –On some torch sets: each tip has its own mixing chamber
© 2012 Delmar, Cengage Learning Torch Tip Care and Use Considerations –Tips may have metal-to-metal seals or an O-ring or gasket between the tip and the torch seat Tighten metal-to-metal seal tips with a wrench Tips with an O-ring or gasket can be tightened by hand –Dirty tips can be cleaned with tip cleaners –Damaged tips or tips with cleaners broken in them can be reconditioned
© 2012 Delmar, Cengage Learning Backfires Backfire –Flame goes out with a loud snap or pop –Causes: Touching the tip against the workpiece Overheating the tip Flame settings are too low Loose tip Damaged seats Dirt in the tip
© 2012 Delmar, Cengage Learning Flashbacks Flame is burning inside the tip, torch hose, or regulator –Produces a high-pitched whistle Close oxygen valve and then close fuel valve Allow torch to cool –Usually indicates a serious problem with the equipment
© 2012 Delmar, Cengage Learning Reverse Flow and Flashback Valves Reverse flow valve –Prevents gases from flowing through the torch into the wrong hose If gases are allowed to mix in the hose or regulator they might explode Flashback arrestor –Will do the job of a reverse flow valve –Will also stop the flame of a flashback
© 2012 Delmar, Cengage Learning Care of the Reverse Flow Valve and Flashback Arrestor Considerations –Both devices must be checked on a regular basis Internal valves may become plugged with dirt –Test reverse flow valve: blow air backwards through the valve –Test flashback arrestor: follow manufacturer's recommended procedure –Replace of not functioning correctly
© 2012 Delmar, Cengage Learning Hoses and Fittings Characteristics –Siamese hoses are molded together as one piece Other hoses may be taped together –Fuel gas hoses must be red and have left-hand threaded fittings –Oxygen hoses must be green and have right-hand threaded fittings –Hoses are available in four sizes
© 2012 Delmar, Cengage Learning Hose Care and Use Considerations –Hoses not in use: gas must be turned off and pressure bled off –Hoses are resistant to burns: not burn-proof –Hoses should be checked for leaks –Hose fitting can be changed if damaged –To replace hose end: hose is cut square
© 2012 Delmar, Cengage Learning Types of Flames Oxyacetylene flame settings –Carburizing flame Excess of fuel gas –Neutral flame Balance of fuel gas and oxygen –Oxidizing flame Excess of oxygen
© 2012 Delmar, Cengage Learning Leak Detection Leak-detection solution –Premixed or concentrate –Must be free flowing –Good quantity of bubbles without film Solution can be: –Dipped –Sprayed –Brushed
© 2012 Delmar, Cengage Learning Figure Safety chain cylinder. Larry Jeffus.
© 2012 Delmar, Cengage Learning FIGURE Connect the free ends of the oxygen (green) and the acetylene (red) hoses to the welding torch. Larry Jeffus.
© 2012 Delmar, Cengage Learning FIGURE Select the proper tip or nozzle and install it on the torch body. Larry Jeffus.
© 2012 Delmar, Cengage Learning FIGURE Back out both regulator-adjusting screws before opening the cylinder valve. Larry Jeffus.
© 2012 Delmar, Cengage Learning FIGURE Stand to one side when opening the cylinder valve. Larry Jeffus.
© 2012 Delmar, Cengage Learning FIGURE Adjust the regulator to read 5 psig (0.35 kg/cm 2 g) working pressure. Larry Jeffus.
© 2012 Delmar, Cengage Learning FIGURE Identify any cylinder that has a problem by marking it. Larry Jeffus
© 2012 Delmar, Cengage Learning Manifold Systems Used when there are a number of work stations or a high volume of gas will be used –Must be located at least 20 feet or more from work –Rooms used for manifolds can be also used for cylinder storage –Piping for high-pressure side of the manifold must be steel, stainless steel, or alloyed copper –Should be tested for leaks at a half times operating pressure
© 2012 Delmar, Cengage Learning Manifold Operation Considerations –Clean pipes with oil-free, noncombustible fluid before regulators are attached –Install regulators and purge the system with nitrogen –Fill pipes with oxygen or fuel gas –Set line pressure as low as possible
© 2012 Delmar, Cengage Learning Summary You will work with experienced welders –After you have developed skills and found a welding job These welders have developed many good shortcuts –Safe way of setting up and testing a system should always be followed Always refer to the manufacturer's operating instructions and safety recommendations
UNIT: Oxy-Fuel Welding, Brazing, Cutting and Heating LESSON: OXY-ACETYLENE EQUIPMENT SAFETY Standard B7.2 – Know how to properly set up, adjust, shut down.
Oxy Fuel Cutting Systems Basic Setup & Use. Typical Torch System Oxygen Cylinder Acetylene Cylinder Method of Securing the cylinders Caps Regulators Backflash.
OXYFUEL WELDING. INTRODUCTION Oxyfuel welding is a welding process where the heat for fusion is supplied by a torch using oxygen and a fuel gas. Several.
Teknologi Dan Rekayasa OXY-ACETYLENE WELDING. Teknologi dan Rekayasa The setting of oxy-acetylene welding equipment OBJECTIVE : After studying this lesson,
Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Unit 23 Using Gas Welding Equipment.
Using Gas Welding Equipment Ag I Ag Mechanics Unit 2.
Oxy-fuel Welding and Cutting By: John Templeton. Objectives Understand facts about oxygen and acetylene Explain functions of oxyacetylene heat List the.
Oxy Fuel Systems Basic Setup & Use Mr. Lacey Livingston High school.
Oxy Acetylene Welding and Cutting Equipment and Setup.
OxyFuel Gas Cutting and Welding Processes Unit 2 TSM 233.
Oxyacetylene is a combination of the words oxygen and acetylene. It refers to the equipment and processes where 2 gases are used together. (In our set.
Oxy – Fuel Torch Ag Mechanics. Equipment: Oxygen Cylinder Acetylene Cylinder Pressure Regulators Oxy-Acetylene hoses Torch Body with Cutting attachment.
UNIT 4: OXYACETYLENE WELDING AND CUTTING IN AGRICULTURE.
Terms and Definitions Base Metal: Metal to be welded Fusion Welding: process that joins metals by heating them to a melting point and allowing them to.
Andrew Brock. Terms The burning qualities of gases are used in Ag Mechanics to heat, weld and cut metals Weld- to join by fusion Fusion- melting.
Oxy/fuel gas welding and cutting equipment. Safety Presentation.
1 Copyright 2004 Lincoln Global Inc. Oxyfuel Gas Welding & Cutting Principles of the Processes.
Oxyacetylene Welding (OAW) The oxyacetylene welding process uses a combination of oxygen and acetylene gas to provide a high temperature flame.
WELDING SAFETY AND PROCEEDURES. OXY-ACETYLENE PROCESSES Acetylene is an unstable gas produced by immersing calcium carbide in water It is dissolved in.
Gas Welding. Brazing -Adhesion: filler metal is melted at a lower melting temp onto the base metal Sticks the metal together.
Oxyacetylene Cutting. After completing this chapter, you will be able to: ◦ Demonstrate the proper and safe method of setting up cylinders, regulators,
CHECK VALVES Are installed to prevent the reverse flow of gases that would result in a combustible mixture in the welding hose, check valves are mounted.
Oxyfuel Welding Equipment Chapter 12. Objectives Identify the various components of an oxyfuel gas welding outfit. Describe the function of each component.
Oxy Fuel Welding Basic Setup & Use. Typical Torch System n Oxygen Cylinder n Acetylene Cylinder n Method of Securing the cylinders n Caps n Regulators.
Torch Unit Gas Heating, Cutting, Brazing, and Welding.
Proper Procedures for Oxyacetylene Processes
The Welding/Cutting Torch Objective 25.0 Demonstrate proper procedures for oxyacetylene processes.
Oxygen Acetylene Equipment Oxygen = Green Acetylene = Red.
Unit: Oxy-Acetylene; Welding, Brazing, Cutting & Heating Lesson: Oxy-Acetylene General Safety Rules.
Oxyacetylene torches Harkness career center. Complete torch assembly.
Welding and Cutting Safety Safety Unit Lesson 5. Oxy-Fuel Welding & Cutting Oxy-fuel welding and cutting are the most common causes of fires in the welding.
UNIT: Oxy-Acetylene Welding, Brazing, Cutting and Heating LESSON: Oxy-Acetylene Welding (OAW) LIGHTING AND SHUTTING DOWN THE TORCH Standard B7.2 - Know.
OxyFuel Equipment. 2 Introduction Oxyfuel welding is a welding process where the heat for fusion is supplied by an torch using oxygen and a fuel gas.
Oxy-Fuel Welding. What is Oxy-Fuel Welding? Process the fuses metal together Does not require electricity Uses a torch and filler rod Similar equipment.
Engineering Gas Welding (Oxy-acetylene) A number of welding processes use a flame produced by burning a mixture of fuel gas and oxygen. The gas usually.
Oxygen Acetylene Welding. OXY-ACET EQUIPMENT I. CYLINDERS I. CYLINDERS Cylinders are controlled by the Interstate Commerce Commission. If you buy.
1 HVACR316 – Piping Torches, Tanks, and Tips. 2 Soldering Basics Soldering is a process used to join piping and tubing to fittings. It is used primarily.
Ag Metals I Using Gas Welding Equipment. Objectives Identify major part of oxyacteylene welding equipment Change oxygen and acetylene cylinders Turn on.
5 th and 8 th Mr. Luper. Keep the cylinders upright at all times In storage On carts Keep cylinders secured Mark cylinders when empty Write.
1 HVACR316 - Piping Torches, Tips, Tanks Torches, Tips, Tanks.
Oxy Fuel Cutting Systems Basic Setup & Use Tim Turner.
Technology Education Dept. Bellwood-Antis High School Mr. Crowell Mr. Mackereth.
NCCER Welding Unit 2. Oxyfuel cutting is a process that uses the flame and oxygen from a cutting torch to cut ferrous metals. Flame is produced by.
Work Area Area Should be Clear and Free of Combustibles Area Should Be Well Ventilated Fire Extinguishers Should Be Available Area Should Be Free.
Agricultural Mechanics Fundamentals & Applications Chapter 22—Using Gas Welding Equipment.
Oxyacetylene Start Up/Shut Down Procedure Prepared by Dr. Dale Carpentier and Mr. Barry Brazelton Monroe Area High School Modified by Georgia Agriculture.
1 UBC International Training Fund Presents. Tensioning.
Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Unit 24 Cutting with Oxyfuels and Other Gases.
HVAC523 Soldering. Soldering Copper Tubing The Common method of joining copper tubing in hydronic heating systems is soft soldering using a 95/5 (95 %
© 2017 SlidePlayer.com Inc. All rights reserved.