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GATE PI

Welding

Joining of Materials

Previous Years Questions

Marks 1

More
In gas tungsten arc welding process, the material coated on pure tungsten electrode to enhance its current carrying capa...
GATE PI 2017
Brazing and soldering are
GATE PI 2014
Which of the following welding process results in the smallest heat affected zone
GATE PI 2011
In resistance seam welding, the electrode is in the form of a
GATE PI 2011
The metal powder used in Thermit welding of steel is:
GATE PI 2004
The current in Amperes used in resistance spot welding of plain carbon steel sheets ($$1$$ to $$3$$ $$mm$$ thick) lies w...
GATE PI 2004
In resistance welding, heat is generated due to the resistance between
GATE PI 2003
High speed electron beam welding is focused on the weld spot using
GATE PI 2003
Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel
GATE PI 2001
The consumption of an oxy-acetylene flame for cutting of steel contains more oxygen
GATE PI 1995
The composition of an oxy-acetylene flame for cutting of steel contain more oxygen.
GATE PI 1994
The joint configuration best suited for adhesive bonding is
GATE PI 1992
Filler material is ......... A...... in resistance welding and the heat generated in the process is directly proportion...
GATE PI 1992
The type of coated electrode most widely used for welding low carbon steel is
GATE PI 1992
Continuous rails for Indian railways are welded by ........ Welding process.
GATE PI 1991
....................... is the non-fusion method of joining dissimilar metals with metals whose melting temp is greater ...
GATE PI 1991
In spot welding of aluminium sheets, the welding current should be .........A........ and weld time should be kept ........
GATE PI 1991
High alloy steel components are preheated before welding for reducing
GATE PI 1991
...
GATE PI 1990
The mode of metal transfer in $$C{O_2}$$-$$MIG$$ welding at low temperature is
GATE PI 1990
With increasing joint thickness, the tensile strength of a brazed joint
GATE PI 1990
In $$TIG$$ welding a ...........A. .......... and ..........B.......... electrode is used. A. non-consumable / consuma...
GATE PI 1990
In welding brass with oxy-acetylene flame, the type of flame used is
GATE PI 1989

Marks 2

More
Two flat steel sheets, each of $$2.5$$ $$mm$$ thickness, are being resistance spot welded using a current of $$6000$$ $$...
GATE PI 2016
In linear gas tungsten arc welding of two plates of the same material, the peak temperature $$T$$ (in $$K$$) is given as...
GATE PI 2016
Two aluminium alloy plates each $$10$$ $$mm$$ thick and $$1$$ $$m$$ long are welded without crowning by multipass tungst...
GATE PI 2015
In an arc welding operation carried out with a power source maintained at $$40$$ volts and $$400$$ amperes, the consumab...
GATE PI 2014
In a $$DC$$ $$arc$$ welding operating, the length characteristic was obtained as $${V_{arc}} = 20 + 5l$$ where the $$arc...
GATE PI 2012
During a steady gas metal arc welding with direct current electrode positive polarity, the welding current, voltage and ...
GATE PI 2010
Autogeneous gas tungsten arc welding of a steel plate is carried out with welding current of $$500A,$$ voltage of $$20V,...
GATE PI 2009
Which pair among the following solid state welding processes uses heat from an external source $$P$$- Diffusion welding ...
GATE PI 2008
Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel
GATE PI 2008
Aluminium strips of $$2mm$$ thickness are joined together by resistance spot welding process by applying an electric cur...
GATE PI 2008
Two pipes of inner diameter $$100mm$$ and outer diameter $$110mm$$ each are joined by flash butt welding using $$30V$$ p...
GATE PI 2008
The $$DC$$ power source for arc welding has the characteristic $$3V + 1 = 240,$$ where $$V=$$ Voltage and $${\rm I}\,\, ...
GATE PI 2007
In a fabrication shop, a $$T$$-joint is to be made between two plates using a chain intermittent, double fillet weld of ...
GATE PI 2005
Consider the following statements: The size of the heat affected zone (HAZ) will increase with $$1.$$ increased starti...
GATE PI 2005
Consider the following statements : The magnitude of residual stresses in welding depends upon $$1.$$ Metal melted / de...
GATE PI 2005
Match List - I (welding problems) with List - II (Causes) and select the correct answer using the codes given below the ...
GATE PI 2005
Two $$8$$ $$mm$$ thick steel plates are placed $$5$$ $$mm$$ apart and welded by a butt joint. Welding is carried out at ...
GATE PI 2005
Match List - I (welding defects) with List - II (causes) and select the correct answer using the codes given below the l...
GATE PI 2003
...
GATE PI 2003
Which of the following process can be used for welding of Aluminium alloys $$P.$$ Submerged arc welding $$Q.$$ Gas metal...
GATE PI 2003
The cold cracking susceptibility of the heat affected zone in an arc weld is influenced by $$P.$$ Entraped hydrogen, $$...
GATE PI 2003
A $$900$$ $$mm$$ long steel plate is welded by manual metal arc welding process using welding current of $$150$$ $$A,$$ ...
GATE PI 2003
In spot pulsed laser welding of aluminium plates (density $$ = 2700kg/{m^3},$$ specific heat $$=896J/kg,$$ melting temp ...
GATE PI 2002
During gas welding of copper sheets a neutral flame was used consuming $$8$$ liters of acetylene. But the weld was found...
GATE PI 1993
...
GATE PI 1992
In welding process, penetration is increased by
GATE PI 1991
Match the following ...
GATE PI 1989
In welding a mild steel sheet using an oxy-acetylene flame, the total amount of acetylene consumed was $$8.0$$ liters th...
GATE PI 1989

Marks 5

More
Resistance spot welding of two steel sheets is carried out in lap joint configuration by using a welding current of $$3$...
GATE PI 2009
Resistance spot welding of two steel sheets is carried out in lap joint configuration by using a welding current of $$3$...
GATE PI 2009
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$...
GATE PI 2003
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$...
GATE PI 2003
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$...
GATE PI 2001
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$...
GATE PI 2001
Two plates with symmetrical $$V$$ joint penetration of $$V$$ angle $$60deg$$ are to be arc welded in a single pass. The ...
GATE PI 1995
The voltage-arc length characteristics of a power source is $$V=20+40L,$$ where $$V=$$ operating voltage in volts and $$...
GATE PI 1993
In $$MIG$$ welding the power source characteristics is $${V_p} = 36 - {\rm I}/60$$ and the arc characteristics is $${V_a...
GATE PI 1992
Two sheets of low carbon steel $$1.5mm$$ thick each are spot welded by passing a current $$10000$$ amps for $$5$$ cycles...
GATE PI 1992
The voltage-arc length characteristic of a $$DC$$ arc is given by $$V=20+40L.$$ where $$L=$$ arc length in $$cm.$$ The p...
GATE PI 1991
A resistance welder is rated at $$50$$ $$kVA,$$ at $$50\% $$ duty cycle. Secondary voltage is always constant at $$25$$ ...
GATE PI 1991

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