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Consider the following statements in respect of the oxidizing flame due to excess oxygen in welding: 1) AT high temperature, it combines with many metals to form hard and brittle oxides. 2) It causes the weld bead and the surrounding area to have a scummy appearance 3) It has good welding effect in welding of copper-base metal. Which of the above statements are correct?

Consider the following statements in respect of the oxidizing flame due to excess oxygen in welding: 1) AT high temperature, it combines with many metals to form hard and brittle oxides. 2) It causes the weld bead and the surrounding area to have a scummy appearance 3) It has good welding effect in welding of copper-base metal. Which of the above statements are correct? Correct Answer 1, 2 and 3

Explanation:

  • When oxygen is in excess it is called oxidizing flame. In the oxidizing flame, the inner white cone is small giving rise to high tip temperature (3300°C).
  • Excess oxygen badly oxidizes the weld metal. It produces a loud sound.
  • The oxidizing flame is useful for welding non-ferrous metal such as copper base metals and zinc base alloys and ferrous metals such as cast iron and manganese steel.
  • Moreover, an excess of oxygen causes the weld bead and the surrounding area to have a scummy or dirty appearance. For these reasons, an oxidizing flame is of limited use in welding.

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