Cellulosic Electrodes in Heavy Machinery Industries

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What is the basic mechanism of tungsten depletion during welding?

Reduction

Oxidation

Decomposition

Evaporation (correct)

How are the mechanical properties of a joint affected by reactive gases during welding?

Degraded (correct)

Unchanged

Enhanced

Strengthened

What role does flux play in welding?

Increasing weld bead smoothness

Causing spattering

Preventing the formation of oxides (correct)

Stabilizing the arc

Which substances are commonly used for arc shielding in welding processes?

Argon, helium, CO2 Signup and view all the answers

What purpose does the slag coating serve in welding?

Smooths the weld bead surface and protects it Signup and view all the answers

How is filler metal supplied during welding using tungsten as electrode?

Fed through a separate wire into the weld pool Signup and view all the answers

What is the main purpose of using cellulosic electrodes?

To increase the arc tension and strengthen the welding arc Signup and view all the answers

What percentage of the coating weight in basic electrodes is cellulose?

30% Signup and view all the answers

What distinguishes cellulosic electrodes from other types when using the same current values?

70% deeper penetration Signup and view all the answers

Which industry benefits most from the wide range of applications of cellulosic electrodes?

Ship building industry Signup and view all the answers

What is the main characteristic of non-consumable electrodes used in gas shielded welding processes?

They melt during the welding process Signup and view all the answers

What property of the weld metal obtained by cellulosic electrodes makes it desirable in welding applications?

Good mechanical properties Signup and view all the answers

What is the main heat source utilized in Shielded Metal Arc Welding (SMAW)?

The heat generated between the covered electrode and the base metal Signup and view all the answers

Which of the following is NOT typically considered when determining the range of currents used in SMAW?

Ambient temperature Signup and view all the answers

What workpiece thickness range is SMAW best suited for?

3 to 19 mm Signup and view all the answers

In multiple-pass SMAW welding, what is required to be removed after each weld bead?

Slag Signup and view all the answers

Which materials are shielded metal arc welding (SMAW) commonly used for?

Steels, stainless steels, cast irons Signup and view all the answers

Why is Shielded Metal Arc Welding (SMAW) also known as 'stick welding'?

Because the welding process involves a stick-shaped electrode Signup and view all the answers

What is the primary distinction among the members of the Oxyfuel Gas Welding (OFW) group?

The type of gases used Signup and view all the answers

Why is acetylene the most popular fuel among the Oxyfuel Gas Welding (OFW) group?

It is capable of producing the highest temperatures Signup and view all the answers

What is the purpose of coating the filler rod with flux in oxyacetylene welding?

To reduce oxidation and clean surfaces Signup and view all the answers

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 Signup and view all the answers

What is the most important process in Oxyfuel Gas Welding (OFW)?

Oxyacetylene welding Signup and view all the answers

What does Oxyacetylene Welding (OAW) employ to direct the flame used in welding?

A welding torch Signup and view all the answers

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 Signup and view all the answers

Which gas dissolves about 25 times its own volume of acetylene?

Acetone Signup and view all the answers

Why are different screw threads standard on C2H2 and O2 cylinders and hoses?

To avoid accidental connection of wrong gases Signup and view all the answers

Which of the following fusion welding processes uses a unique technology to develop heat for melting?

Electron beam welding Signup and view all the answers

What distinguishes fusion welding processes like electron beam welding from arc, resistance, or oxyfuel welding?

They use different technologies for melting heat Signup and view all the answers

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 Signup and view all the answers