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Welding

1. Welding is a process of joining together metallic parts by heating the place of contact to the fusion state.

2. Welding processes are classified according to the source of energy employed for heating, the metals and the state of the metal at the place of welding.

3. There are different types of welding such as hammer welding, thermit welding, electric arc welding, gas welding, etc.

4. Hammer welding is a process in which two heated metal parts are joined and fused together by force from a power hammer.

5. Resistance welding process forms a whole group consisting of many types of welding such as spot welding, butt welding and others.

6. In arc welding the work piece are not melted by a flame. They are melted by an electric arc. In order to create the arc, a powerful electric current must be provided. The current must be at least 60 A, otherwise the arc will not create enough heat.

7. In gas welding, it is necessary to use a mixture of two gases. To create a hot flame, a combustible gas must be mixed with oxygen.

Gas welding is normally used to join steel to steel.

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Process, metal, metallic, contact, classify, energy, type, gas, chemical, reaction, section, form, electric, normally.

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Process, together, heating, contact, fusion, state, according, sours, energy, different, such, hammer, electric, gas, parts, rails, resistance, sport, mixture.

Date: 2015-12-13; view: 784; Нарушение авторских прав