1a) State weather the following statements are true or false. Give a brief reaso
ID: 2073396 • Letter: 1
Question
1a) State weather the following statements are true or false. Give a brief reason for your choice; (a) (b) It is easier to spot weld high alloy steel then mild steel Brazing is more suitable for joining dissimilar metals than pressure welding (c) Manual metal arc is a fusion process (d) The major problem in arc welding processes is the variability (e) (f) (g) between welds. Titanium is easier to weld using TIG, than Aluminium Bi-metallic strips are produced using a pressure welding process Fluxes of MMA electrodes used to weld mild steel, frequently contain sulphur additives (h) Wide freezing range alloys are more difficult to weld than alloys of (i) The welding current when TIG welding Titanium should be closely (j) Cracks formed when joining high carbon steel using MMA can be eutectic composition controlled eliminated by post weld treatment. (2.5 Marks EACH)Explanation / Answer
a) false ;
Mild steel is a low carbon steel which offers lower reaistance to the flow current as compared to high alloy steel.so it is easier to weld mild steel
b)true
For pressure welding it is required to have atleast one ductile material which should not exhibit extreme work hardening.
In brazing no unsuitable phases can be formed.
c)true
In fusion welding process.metals are joined together by melting one of the material by means of arc or gas in manual arc welding also it is required to melt one of the metal by using electric arc so it is called as fusion welding process
d)true
Beacuse of variability between the welds, various types of electrodes and techniques need to be used which creats major problem in arc welding
e) false
TIG can be used to weld non ferrous metals like aluminium and titanium but as the melting point of aluminium is lower than that of titanium , it is easier to weld aluminium than titanium
f) true
bimetallic strips are generally produced with the help of pressure welding process as no heat and flux is required in this process.(application of heat and flux may distort the bimetallic strip)
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