Text 6: «Welding»Welding is a proce

Text 6: «Welding»

Welding is a process when metal parts are joined together by the application of heat, pressure, or a combination of both. The processes of welding can be divided into two main groups:
• pressure welding, when the weld is achieved by pressure and
• heat welding, when the weld is achieved by heat. Heat welding is the most common welding process used today.
Nowadays welding is used instead of bolting and riveting in the construction of many types of structures, including bridges, buildings, and ships. It is also a basic process in the manufacture of machinery and in the motor and aircraft industries. It is necessary almost in all productions where metals are used.
The welding process depends greatly on the properties of the metals, the purpose of their application and the available equipment. Welding processes are classified according to the sources of heat and pressure used.
The welding processes widely employed today include gas welding, arc welding, and resistance welding. Other joining processes are laser welding, and electron-beam welding.
Gas Welding
Gas welding is a non-pressure process using heat from a gas flame. The flame is applied directly to the metal edges to be joined and simultaneously to a filler metal in the form of wire or rod, called the welding rod, which is melted to the joint. Gas welding has the advantage of using equipment that is portable and does not require an electric power source. The surfaces to be welded and the welding rod are coated with flux, a fusible material that shields the material from air, which would result in a defective weld.
Arc Welding
Arc-welding is the most important welding process for joining steels. It requires a continuous supply of either direct or alternating electrical current. This current is used to create an electric arc, which generates enough heat to melt metal and create a weld.
Arc welding has several advantages over other welding methods. Arc welding is faster because the concen¬tration of heat is high. Also, fluxes are not necessary in certain methods of arc welding. The most widely used arc-welding processes are shielded metal arc, gas-tungsten arc, gas-metal arc, and submerged arc.
Shielded Metal Arc
In shielded metal-arc welding, a metallic electrode, which conducts electricity, is coated with flux and connected to a source of electric current. The metal to be welded is connected to the other end of the same source of current. An electric arc is formed by touching the tip of the electrode to the metal and then drawing it away. The intense heat of the arc melts both parts to be welded and the point of the metal electrode, which supplies filler metal for the weld. This process is used mainly for weld¬ing steels.

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Text 6: "Welding"Welding is a process when metal parts are joined together by the application of heat, pressure, or a combination of both. The processes of welding can be divided into two main groups:• pressure welding, when the weld is achieved by pressure and• heat welding, when the weld is achieved by heat. Heat welding is the most common welding process used today.Nowadays welding is used instead of bolting and riveting in the construction of many types of structures, including bridges, buildings, and ships. It is also a basic process in the manufacture of machinery and in the motor and aircraft industries. It is necessary in almost all productions where metals are used.The welding process depends greatly on the properties of the metals, the purpose of their application and the available equipment. Welding processes are classified according to the sources of heat and pressure used.The welding processes widely employed today include gas welding, arc welding and resistance welding. Other joining processes are laser welding, and electron beam welding.Gas WeldingGas welding is a non-pressure process using heat from a gas flame. The flame is applied directly to the metal edges to be joined and simultaneously to a filler metal in the form of wire or rod, so-called the welding rod, which is melted to the joint. Gas welding has the advantage of using equipment that is portable and does not require an electric power source. The surfaces to be welded and the welding rod are coated with flux, a fusible material that shields the material from air, which would result in a defective weld.Arc WeldingArc welding is the most important welding process for joining steels. It requires a continuous supply of either direct or alternating electrical current. This current is used to create an electric arc, which generates enough heat to melt the metal and create a weld.Arc welding has several advantages over other welding methods. Arc welding is faster because the concen tration of ¬ heat is high. Also, fluxes are not necessary in certain methods of arc welding. The most widely used arc-welding processes are shielded metal arc, gas tungsten arc, gas-metal arc and submerged arc.Shielded Metal ArcIn shielded metal-arc welding, a metallic electrode, which conducts electricity, is coated with flux and connected to a source of electric current. The metal to be welded is connected to the other end of the same source of current. An electric arc is formed by touching the tip of the electrode to the metal and then drawing it away. The intense heat of the arc melts both parts to be welded and the point of the metal electrode, which supplies filler metal for the weld. This process is used mainly for weld ¬ ing steels.

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text 6: Welding»welding is a process when the metal parts are joined together by the application of heat, pressure, or a combination of both. the processes of welding can be divided into two main groups:the pressure welding, when the weld is achieved by pressure andthe heat welding, when the weld is achieved by heat. heat welding is the most common welding process used today.nowadays welding is used instead of bolting and riveting in the construction of many types of structures, including bridges, buildings, and ships. it is also a basic process in the manufacture of machinery and in the motor and aircraft industries. it is necessary that in all productions where metals are used.the welding process depends greatly on the properties of the metals, the purpose of the application and the available equipment. welding processes are classified according to the sources of heat and pressure used.the welding processes widely employed today include gas welding, arc welding, and resistance welding. other joining processes in laser welding, and electron - beam welding.gas weldinggas welding is a non pressure process using heat from a gas flame. the flame is applied directly to the metal first floor to be joined and simultaneously to a filler metal in the form of wire or www.addic7ed.com, called the welding www.addic7ed.com, which is melted to the joint. gas welding has the advantage of using equipment that is portable and does not require an electric power source. the into to be welded and the welding www.addic7ed.com are coated with flux, a fusible material that shields the material from air, which would result in a defective weld.arc weldingarc - welding is the most important welding process for joining steels. it requires a continuous supply of either direct or alternating electrical current. this current is used to create an electric arc, which generates enough heat to melt metal and create a weld.arc welding has several advantages over other welding methods. arc welding is faster because the concen¬tration of heat is high. the fluxes are not necessary in certain methods of arc welding. the most widely used arc - welding processes are shielded metal arc, gas tungsten arc, gas metal arc, and the arc submerged.Shielded metal arcin shielded metal arc welding, a metallic electrode, which conducts vitamin, is coated with flux and connected to a source of electric current. the metal to be welded is connected to the other end of the same source of current. an electric arc is formed by the tip of the electrode quite to the metal and then drawing it away. the intense heat of the arc melts both parts to be welded and the point of the metal electrode, which supplies filler metal for the weld. this process is used mainly for weld¬ing steels.