a) Why is automation of the covered electrode arc source difficult? b) what properties is a metal with good resistance welding ability expected to have? c) Why is the heat transfer factor higher in arc welding processes with the consumed electrode than the methods used with the non-consumed electrode?
1)
a) Why is automation of the covered electrode arc source difficult?
b) what properties is a metal with good resistance welding ability expected to have?
c) Why is the heat transfer factor higher in arc welding processes with the consumed electrode than the methods used with the non-consumed electrode?
d) Why is it important to weld thin and long instead of thick and short?
e) why is it important that the source root is designed to be forced to press, not pull?
2) there is a characteristic liquid penetration error on a large piece of steel poured in the sand mold. The surface of the piece consists of a mixture of sand and metal.
a) Explain at least 3 of the steps that can be taken to correct this error.
b) what other types of casting errors may possibly occur in each of these steps? Explain
3) grain structure formed in part after casting;
a) Describe by drawing a figure.
b) what problems can this grain structure pose? Please explain. How can these problems be cured?
4) explain two of the non-destructive inspection methods used in the detection of errors in welding connections by drawing a figure.
5) . Explain the production process by drawing a shape with termite welding
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