Discussion
Which of the following property of cast iron makes it difficult to be welded?
Answer: C
Cast iron is hard to weld because of its hardness and brittleness.
Cast iron has a high carbon content (about 2% to 4%), which makes it hard and brittle with very little ductility. When the weld heats and cools part of the casting, the uneven expansion and contraction cannot be absorbed by stretching, so it cracks, and fast cooling near the weld forms even harder, brittle structures. That is why cast iron needs preheating, special electrodes and slow cooling.
Cast iron actually has good fluidity and its low melting point helps casting rather than hindering welding. High compressive strength is a useful property, not a welding problem.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development