Which one of the following methods is
generally not used in welding of chromium molybdenum steels?
Oxyacetylene
Submerged arc
Thermite
Resistance
Resistance
●Oxyacetyleneis generally not used in
welding of chromium molybdenum steels.
●In chromium molybdenum steels, if we
useoxyacetylene welding then chromium presentin the steel will react with
oxygen and formchromium oxide. Due to this the corrosionresistance of the steel
will decrease and jointwill fail easily due to corrosion.
Hence, the correct option is (D).
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