Welding

Good Essays
Topics: Welding
TIG welding

T

ungsten inert gas (TIG) welding is a high quality low deposition rate welding process. It uses an arc struck between a nonconsumable tungsten electrode and the work to fuse the base material and thereby form a welded joint.
The TIG welding process may be used on thin sheet material without the addition of a filler metal (autogenous TIG welding).
Alternatively, when working on thicker sheet or when joining dissimilar materials, a separate wire filler metal is added into the arc region where it is melted and directed by the welder into the molten weld pool.
The weld pool, the hot tungsten electrode and the melting filler wire are protected from atmosphere by a shield of inert or slightly reducing gas.
Argon is often used although productivity and quality benefits can be gained by using mixtures of argon and helium or argon and hydrogen (see the table of recommended GeminiTM gases over the page).

Operation
TIG welding is suitable for manual, mechanised and automatic (orbital) operation.
In manual welding, the operator points the tungsten electrode in the direction of welding and uses the arc to melt the base material along the joint,

Double operator AC TIG welding of an aluminium vessel.

ahead of the molten weld pool.
The filler metal is generally added at the leading edge of the advancing weld pool.

Welding current
Both Direct Current (DC) and
Alternating Current (AC) may be used when TIG welding, the choice depending upon the type of material to be welded.
DC (electrode negative) is used for the following

materials:– carbon steel q copper q stainless steels q nickel alloys q titanium q zirconium.
AC is used for the following materials:– q aluminium and its alloys q magnesium q aluminium bronze. q Non-consumable electrodes Ozone reduction

Electrode diameter to current dia. mm

maximum operating current (A) thoriated DC

zirconiated AC

1.2

70

40

You May Also Find These Documents Helpful

  • Powerful Essays

    welding

    • 3818 Words
    • 16 Pages

    UNIT 3 WELDING WORKSHOP Structure 3.1 Introduction Objectives 3.2 3.3 Tools to be Used in Welding Workshop 3.4 3.5 Experiment No. 1 Resistance Welding 3.6 Seam Welding I Practice Session 3.7 Experiment No. 2 3.8 3.9 Experiment No. 3 Seam Welding Electrodes 3.1 INTRODUCTION Welding is a process of joining similar metals by application of heat with or without application of pressure and addition of filler material. The result is a continuity of homogeneous…

    • 3818 Words
    • 16 Pages
    Powerful Essays
  • Good Essays

    welding

    • 963 Words
    • 4 Pages

    Being a welder is a great occupation What is welding, and how does it work? Not many people know what welding is or how it works. According to Mary Bonk“welding is the process of heating and melting metal parts to join them together” (Bonk,3). A welding machine uses electricity to melt the electrode, fusing one piece of metal to another. The welding machine uses a ground that connects to the surface that allows the welder to create a flowing currant passing through the electrode and…

    • 963 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    Welding

    • 1576 Words
    • 7 Pages

    Name Welding 219 06 June 2013 Welding “Welding is a process critical to our present state of civilization and technical advancement, yet little understood and most often taken for granted” (Haynes and Storer 1). We are constantly hearing through television and other media sources that the job market for people trained in some sort of vocational skill is in very high demand. Media advertisements are encouraging students to consider a vocational skill when looking at their future. Welding is one…

    • 1576 Words
    • 7 Pages
    Powerful Essays
  • Better Essays

    Welding

    • 2045 Words
    • 9 Pages

    WELDING OF CAST IRON Cast iron is an extremely versatile material, used in thousands of industrial products. It is hard, wearresistant, and relatively inexpensive. Like steel, it is available in many different grades and compositions. While we usually think of cast iron as being brittle (having low ductility), this is not true of all cast irons, as we shall see shortly. Cast iron, like steel, is an iron-carbon alloy. In composition and structure, and in some of its properties, it is quite different…

    • 2045 Words
    • 9 Pages
    Better Essays
  • Good Essays

    Welding

    • 621 Words
    • 3 Pages

    Homework research assignment Welding With the aid of a neat diagram explain what electric arc welding is. The dictionary defines electric arc welding as “A technique in which metals are welded using heat generated by an electric arc.” It is a type of welding that uses a welding power supply to create and electric arc between an electrode (the dictionary defines electrode as “A conductor through which electricity enters or leaves an object, substance, or region.”) and the base material to melt…

    • 621 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Welding

    • 300 Words
    • 2 Pages

    term, which covers processes such as welding, brazing, soldering, adhesive bonding, and mechanical joining. These processes are an important and necessary aspect of manufacturing operations. This paper deals with one topic in particular ‘Welding’. Welding is a process for joining similar metals. Welding joins metals by melting and fusing the base metals being joined and the filler metal applied. Welding employs pinpointed, localized heat input. Most welding involves ferrous-based metals such as…

    • 300 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Welding

    • 561 Words
    • 2 Pages

    essay The three types of welding are Mig, Tig, and Stick. All three of these welding styles have special purposes and are widely used in the world. Mig or Metal Inert Gas welding is the most common type of welding. Tig, or Tungsten Inert Gas, welding is the hardest method to learn, but it has the most satisfying finish welds. Stick or Shielded Metal Arc welding can be done under water, to repair large channel boats that aren’t able to be lifted out of the water. Mig welding uses a supply of argon…

    • 561 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Welding

    • 322 Words
    • 2 Pages

    Is Our Constitution Still Relevant? The United States Constitution is often called “a miracle document” because it has proved so enduring while so many other attempts at self-government have failed. In reality, it was a miracle of sorts that the Constitutional Convention ever materialized in the first place. This is one of the reasons I believe the constitution is still relevant. The articles of confederation weren’t working so the constitutional convention was finally held in order to draft the…

    • 322 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Welding Outline

    • 589 Words
    • 3 Pages

    Welding Outline 1. History of Welding a. Welding can be traced back to the Bronze Ages, where pressure welding was first developed. b. The Egyptians were also one of the first to use pressure welding. c. The blacksmith of the middle ages was the one to bring forge welding into the world. d. Early types of welding were used for holding items together for some project. As for the blacksmith in the Middle Ages it was more for horse shoes or fixing iron material…

    • 589 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Welding Parameters

    • 1216 Words
    • 5 Pages

    Optimization of different welding processes using statistical and numerical approaches – A reference guide Abstract Welding input parameters play a very significant role in determining the quality of a weld joint. The joint quality can be defined in terms of properties such as weld-bead geometry, mechanical properties, and distortion. Generally, all welding processes are used with the aim of obtaining a welded joint with the desired weld-bead parameters, excellent mechanical properties with minimum…

    • 1216 Words
    • 5 Pages
    Satisfactory Essays