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 from steel. While many grades of cast iron can be welded successfully, not all cast iron is weldable, and welding of any cast iron presents problems not usually encountered in the welding of steel. Composition and Grades of Cast Iron Cast iron is by no means pure iron. In fact, there is less iron in any grade of cast iron than there is in a low-carbon steel, which may be 98% iron. Almost every cast iron contains well over 2.0% carbon; some contain as much as 4.0% . In addition, cast iron usually contains 1.2 to 2.5% silicon, 0.5 to 0.8% manganese, and (as in steel) small percentages of sulphur and phosphorous. It is the high percentage of carbon that make cast iron different from steel in many of its properties. In a finished steel, all the carbon is combined with iron in the form of iron carbides, whether those carbides are in grains of pearlite, in grains of cementite, or in scattered small particles of carbide. In cast iron, most of the carbon is usually present in uncombined form, as graphite. (Graphite is one of the two crystalline forms of carbon; diamond is the other). The differences between the general types of cast iron most widely used arise chiefly from the form which the graphite assumes in the finished iron. Gray Iron. Of the general types of cast iron, gray iron is by far the most widely used. The term ”gray iron” was adopted originally to distinguish it, by color of the fractured metal, from white iron, a form of cast iron in which all the carbon is
UNIT 3 WELDING WORKSHOP
Tools to be Used in Welding Workshop
Experiment No. 1
Experiment No. 2
Experiment No. 3
Seam Welding Electrodes
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
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….
06 June 2013
“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….
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
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….
Homework research assignment
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….
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….
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….
Welding Risk and Safety Precautions
Welding is a really good blue collar job that pays well, but has its ups and downs. Welders have to deal with hazardous welding fumes that can affect their health in numerous ways. There are several different types of welding fumes and mixtures that a welder can inhale while performing a welding task. A welder’s risk of getting sick from welding depends on the different types of metals being welded and the….
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….
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….