1. The operation of preparing the pieces of metal for forge welding





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MCQ->The simplest method of welding two pieces of metal together is known as pressure welding.The ends of a metal are heated to a white heat-for iron,the welding temperature should be about 1300C-in a flame.At this temperature the metal becomes plastic.The ends are pressed or hammered together,and the joint is smoothed off.Care must be taken to ensure that surfaces are thoroughly clean first,for dirt will weaken the weld.Moreover,the heating of iron or steel to a high temperature cause oxidation,and a film of oxide is added to the heated surfaces.For this reason,flux is applied to the heated metal.At welding heat,flux melts and the oxide particles are dissolved in it together with any other impurities which may be present.The metal surfaces are pressed together,and the flux is squeezed out from the center of the weld.A number of different types of weld may be used,but for fairly thick bars of metals,a vee-shaped belt should be normally employed.It is rather stronger than ordinary butt weld. The simplest way of welding two pieces of metal together is....
MCQ->The operation of preparing the pieces of metal for forge welding....
MCQ-> Rearrange the following six sentences/group of sentences (A), (B), (C),(D), (E) and (F) in the proper sequence to form a meaningful paragraph: then answer the questions given below them. (A) The merchant greedily counted his gold and said, “The purse I dropped had 200 pieces of gold in it. You’ve already stolen more than the reward! Go away or I will tell the police.” (B) The judge, looking towards the merchant said, “you stated that the purse you lost contained 200 pieces of gold. Well, that’s a considerable cost. But, the purse this beggar found had only 100 pieces of gold”. (C) Being an honest man, the beggar came forward and handed the purse to the merchant saying, “Here is your purse. May I have my reward now?” (D) ” This purse therefore cannot be the one you lost.” And, with that, the judge gave the purse and all the gold to the beggar. (E) A beggar found a leather purse that someone had dropped in the marketplace. On opening it, he discovered that it contained 100 pieces of gold. Then he heard a merchant shout,“A reward! A reward to the one who finds my leather purse”. (F) “I am an honest man,” said the beggar defiantly. “Let us take this matter to the court, The judge patiently listened to both sides of the story.Which of the following should be the FIRST sentence after the rearrangement ?
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MCQ->When two metal pieces of different thicknesses are to be welded by projection welding, then the projections should be made on __________ metal piece.....
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