The main constituents of soldering alloy are
The solder used for the soldering operation may be
1. a soft solder which is an alloy of lead and tin in varying proportions.
2. a hard solder which is copper-zinc alloy, copper-silver alloy or a nickel-silver alloy.
An alloy of copper, zinc and silver often used in fabrication work is called
Flux is used in soldering to
The action of flux in soldering joints is
(i) to break and remove the oxide layer formed along the joined faces.
(ii) to aid the capillarity of the molten metal and facilitate its flow around and through the joint.
(iii) to act as cleansing agent for the removal of dirt etc.
The process of joining metallic pieces by introducing non-ferrous alloys in the liquid state between the metallic piece and allowing to solidify is known as
A brazed joint can be satisfactorily made on an article made of
The commonly used flux for brazing is
Which of the following welding process is also known as upset welding?
End to end welding pressure is applied axially for hot upsetting process.
Assume that the two 2 mm thick steel sheets are being sport welded at a current of 5500 A and current-flow time t= 0.15s. Using electrodes 6 mm in diameter, estimate the amount of heat generated in resistance spot welding.
(Take Rc = 250 μΩ)
Porosity in welds may be caused by followings except:
Typical applications of EBW are following except: