Test: Fabrication Processes (Welding) - 1 - Mechanical Engineering MCQ

The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is  

Consider the following statements in respect of oxy-acetylene welding:    

1. The joint is not heated to a state of fusion.       

2. No pressure is used.    

3. Oxygen is stored in steel cylinder at a pressure of 14 MPa.    

4. When there is an excess of acetylene used, there is a decided change in the appearance of flame.    

Which of the statements given above are correct?  

Assertion (A): If neutral flame is used in oxy-acetylene welding, both oxygen and acetylene cylinders of same capacity will be emptied at the same time.  

Reason (R): Neutral flame uses equal amounts of oxygen and acetylene.  

In manual arc welding, the equipment should have drooping characteristics in order to maintain 

Open-circuit voltage of 60 V and current of 160A were the welding conditions for arc welding of a certain class of steel strip of thickness 10 mm. For arc welding of 5mm thick strip of the same steel, the welding voltage and current would be  

The electrodes used in arc welding are coated. This coating is not expected to 

Pinch effect in welding is the result of             

The coating material of an arc welding electrode contains which of the following?  

1. Deoxidising agent  

2. Arc stabilizing agent  

3. Slag forming agent

Select the correct answer using the code given below:  

 Which one of the following welding processes uses non- consumable electrodes?   

For butt -welding 40 mm thick steel plates, when the expected quantity of such jobs is 5000 per month over a period of 10 year, choose the best suitable welding process out of the following available alternatives. 

Tool material not suited to resistance welding is          

Spot welding of two 1 mm thick sheets of steel (density = 8000 kg/m³) is carried out successfully by passing a certain amount of current for 0.1 second through the electrodes. The resultant weld nugget formed is 5 mm in diameter and 1.5 mm thick. If the latent heat of fusion of steel is 1400 kJ/kg and the effective resistance in the welding operation in 200 Ω , the current passing through the electrodes is approximately    

Consider the following processes:                                                          

1. Gas welding    

2. Thermit welding  

3. Arc welding    

4. Resistance welding

The correct sequence of these processes in increasing order of their welding temperatures is  

Consider the following welding processes:

1. TIG welding    

2. Submerged arc welding

3. Electro-slag welding  

4. Thermit welding              

Which of these welding processes are used for welding thick pieces of metals?  

Electron beam welding can be carried out in                  

Which one of the following welding processes consists of minimum heat affected zone (HAZ)?   

Which one of the following is not a fusion welding process?