30 Questions
What is the basic mechanism of tungsten depletion during welding?
Evaporation
How are the mechanical properties of a joint affected by reactive gases during welding?
Degraded
What role does flux play in welding?
Preventing the formation of oxides
Which substances are commonly used for arc shielding in welding processes?
Argon, helium, CO2
What purpose does the slag coating serve in welding?
Smooths the weld bead surface and protects it
How is filler metal supplied during welding using tungsten as electrode?
Fed through a separate wire into the weld pool
What is the main purpose of using cellulosic electrodes?
To increase the arc tension and strengthen the welding arc
What percentage of the coating weight in basic electrodes is cellulose?
30%
What distinguishes cellulosic electrodes from other types when using the same current values?
70% deeper penetration
Which industry benefits most from the wide range of applications of cellulosic electrodes?
Ship building industry
What is the main characteristic of non-consumable electrodes used in gas shielded welding processes?
They melt during the welding process
What property of the weld metal obtained by cellulosic electrodes makes it desirable in welding applications?
Good mechanical properties
What is the main heat source utilized in Shielded Metal Arc Welding (SMAW)?
The heat generated between the covered electrode and the base metal
Which of the following is NOT typically considered when determining the range of currents used in SMAW?
Ambient temperature
What workpiece thickness range is SMAW best suited for?
3 to 19 mm
In multiple-pass SMAW welding, what is required to be removed after each weld bead?
Slag
Which materials are shielded metal arc welding (SMAW) commonly used for?
Steels, stainless steels, cast irons
Why is Shielded Metal Arc Welding (SMAW) also known as 'stick welding'?
Because the welding process involves a stick-shaped electrode
What is the primary distinction among the members of the Oxyfuel Gas Welding (OFW) group?
The type of gases used
Why is acetylene the most popular fuel among the Oxyfuel Gas Welding (OFW) group?
It is capable of producing the highest temperatures
What is the purpose of coating the filler rod with flux in oxyacetylene welding?
To reduce oxidation and clean surfaces
In oxyfuel gas welding, what is the second stage reaction involving acetylene and oxygen?
$2CO + H_2 + 1.5O_2 2CO_2 + H_2O$ + heat
What is the most important process in Oxyfuel Gas Welding (OFW)?
Oxyacetylene welding
What does Oxyacetylene Welding (OAW) employ to direct the flame used in welding?
A welding torch
What is the purpose of packing storage cylinders with porous filler material saturated with acetone for C2H2?
To prevent the accidental mixing of different gases
Which gas dissolves about 25 times its own volume of acetylene?
Acetone
Why are different screw threads standard on C2H2 and O2 cylinders and hoses?
To avoid accidental connection of wrong gases
Which of the following fusion welding processes uses a unique technology to develop heat for melting?
Electron beam welding
What distinguishes fusion welding processes like electron beam welding from arc, resistance, or oxyfuel welding?
They use different technologies for melting heat
Which book would be a relevant source for further information on Fusion Welding?
FUNDAMENTALS OF MODERN MANUFACTURING Materials, Processes, and Systems, Mikell P.Groover, 2010 John Wiley & Sons
Explore the use of cellulosic electrodes in industries like ship building, boiler and pressure vessels, and steel constructions subjected to dynamic loads. Learn about how the organic materials in the coating decompose in the arc to increase arc tension.
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