WELDING 4 TIG AND CO2 WELDING - Practice Mode
1) How the molten puddle is protected against atmospheric oxygen and nitrogen while using bare electrode in MAG welding?
2) What is the purpose of inlet end of heater connected to gas cylinder in CO2 welding?
Explanation:
A back sight reading is typically taken at the starting point of a leveling operation, while an intermediate sight reading is taken at a point between the starting point and the final point.
The difference in level between a back sight reading of 1.430 meters and an intermediate sight reading of 2.015 meters is the difference between the two readings, which is:
1.430m - 2.015m = 0.585m(fall).
This means the intermediate point is 0.585m higher than the starting point.
3) Which gas mixture is used in GMAW spray transfer for 25 - 76 mm thick Aluminium block?
4) What is the gas mixture used for copper, nickel and alloys of heavier gauge thickness in GMAW spray transfer?
Explanation:
In surveying, a backsight and an intersight are both readings taken with an instrument such as a level to determine the difference in elevation between two points.
A backsight reading is typically taken at the starting point of a survey, and serves as a reference elevation for all subsequent measurements.
An intersight reading is taken after the starting point, on another point and it measures the difference in elevation between the current point and the starting point.
If the back sight reading is 3.370m and the intersight reading is 2.975m, the difference in level is the difference between the two readings, which is:
3.370m - 2.975m = 0.395m ( or 39.5 cm)