# Welding · Joining of Materials · GATE PI

Start Practice## Marks 1

GATE PI 2017

In gas tungsten arc welding process, the material coated on pure tungsten electrode to enhance its current carrying capacity is

GATE PI 2014

Brazing and soldering are

GATE PI 2011

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 2004

The current in Amperes used in resistance spot welding of plain carbon steel sheets ($$1$$ to $$3$$ $$mm$$ thick) lies within the range:

GATE PI 2004

The metal powder used in Thermit welding of steel is:

GATE PI 2003

High speed electron beam welding is focused on the weld spot using

GATE PI 2003

In resistance welding, heat is generated due to the resistance between

GATE PI 2001

Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel

GATE PI 1995

The consumption of an oxy-acetylene flame for cutting of steel contains more oxygen

GATE PI 1994

The composition of an oxy-acetylene flame for cutting of steel contain more oxygen.

GATE PI 1992

The joint configuration best suited for adhesive bonding is

GATE PI 1992

The type of coated electrode most widely used for welding low carbon steel is

GATE PI 1992

Filler material is ......... A...... in resistance welding and the heat generated in the process is directly proportional to ........ B.........
(A)....

GATE PI 1991

Continuous rails for Indian railways are welded by ........ Welding process.

GATE PI 1991

High alloy steel components are preheated before welding for reducing

GATE PI 1991

In spot welding of aluminium sheets, the welding current should be .........A........ and weld time should be kept ............B......... than for $$M...

GATE PI 1991

....................... is the non-fusion method of joining dissimilar metals with metals whose melting temp is greater than $${400^ \circ }C$$.

GATE PI 1990

With increasing joint thickness, the tensile strength of a brazed joint

GATE PI 1990

...

GATE PI 1990

The mode of metal transfer in $$C{O_2}$$-$$MIG$$ welding at low temperature is

GATE PI 1990

In $$TIG$$ welding a ...........A. .......... and ..........B.......... electrode is used.
A. non-consumable / consumable
B. coated / bare ...

GATE PI 1989

In welding brass with oxy-acetylene flame, the type of flame used is

## Marks 2

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 ܶ$$T = {{{c_1}q} \over \alpha...

GATE PI 2016

Two flat steel sheets, each of $$2.5$$ $$mm$$ thickness, are being resistance spot welded using a current of $$6000$$ $$A$$ and weld time of $$0.2$$ $...

GATE PI 2015

Two aluminium alloy plates each $$10$$ $$mm$$ thick and $$1$$ $$m$$ long are welded without crowning by multipass tungsten inert gas butt welding. The...

GATE PI 2014

In an arc welding operation carried out with a power source maintained at $$40$$ volts and $$400$$ amperes, the consumable electrode melts and just fi...

GATE PI 2012

In a $$DC$$ $$arc$$ welding operating, the length characteristic was obtained as $${V_{arc}} = 20 + 5l$$ where the $$arc$$ length $$l$$ was varied bet...

GATE PI 2010

During a steady gas metal arc welding with direct current electrode positive polarity, the welding current, voltage and weld speed are $$150A,$$ $$30V...

GATE PI 2009

Autogeneous gas tungsten arc welding of a steel plate is carried out with welding current of $$500A,$$ voltage of $$20V,$$ and weld speed of $$20mm/mi...

GATE PI 2008

Two pipes of inner diameter $$100mm$$ and outer diameter $$110mm$$ each are joined by flash butt welding using $$30V$$ power supply. At the interface,...

GATE PI 2008

Aluminium strips of $$2mm$$ thickness are joined together by resistance spot welding process by applying an electric current $$6000$$$$A$$ for $$0.15s...

GATE PI 2008

Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel

GATE PI 2008

Which pair among the following solid state welding processes uses heat from an external source
$$P$$- Diffusion welding
$$Q$$- Friction welding
$$R$$-...

GATE PI 2007

The $$DC$$ power source for arc welding has the characteristic $$3V + 1 = 240,$$ where $$V=$$ Voltage and $${\rm I}\,\, = $$ current in amp. For maxim...

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 $$20$$ $$V$$ and speed of $$5$...

GATE PI 2005

Match List - I (welding problems) with List - II (Causes) and select the correct answer using the codes given below the lists:
...

GATE PI 2005

Consider the following statements:
The size of the heat affected zone (HAZ) will increase with
$$1.$$ increased starting temperature
$$2.$$ increase...

GATE PI 2005

Consider the following statements :
The magnitude of residual stresses in welding depends upon
$$1.$$ Metal melted / deposited
$$2.$$ Design of weld...

GATE PI 2005

In a fabrication shop, a $$T$$-joint is to be made between two plates using a chain intermittent, double fillet weld of $$6$$ $$mm$$ leg length. The i...

GATE PI 2003

A $$900$$ $$mm$$ long steel plate is welded by manual metal arc welding process using welding current of $$150$$ $$A,$$ arc voltage of $$20$$ $$V$$ an...

GATE PI 2003

The cold cracking susceptibility of the heat affected zone in an arc weld is influenced by
$$P.$$ Entraped hydrogen,
$$Q.$$ Residual stresses
$$R.$$ ...

GATE PI 2003

Which of the following process can be used for welding of Aluminium alloys
$$P.$$ Submerged arc welding
$$Q.$$ Gas metal arc welding
$$R.$$ Electrosl...

GATE PI 2003

Match List - I (welding defects) with List - II (causes) and select the correct answer using the codes given below the lists
...

GATE PI 2003

...

GATE PI 2002

In spot pulsed laser welding of aluminium plates (density $$ = 2700kg/{m^3},$$ specific heat $$=896J/kg,$$ melting temp $$=933K,$$ latent heat of melt...

GATE PI 1993

During gas welding of copper sheets a neutral flame was used consuming $$8$$ liters of acetylene. But the weld was found to be defective. So it was re...

GATE PI 1992

...

GATE PI 1991

In welding process, penetration is increased by

GATE PI 1989

In welding a mild steel sheet using an oxy-acetylene flame, the total amount of acetylene consumed was $$8.0$$ liters the oxygen consumption from the ...

GATE PI 1989

Match the following
...

## Marks 5

GATE PI 2009

Resistance spot welding of two steel sheets is carried out in lap joint configuration by using a welding current of $$3$$ $$KA$$ and a weld time of $$...

GATE PI 2009

Resistance spot welding of two steel sheets is carried out in lap joint configuration by using a welding current of $$3$$ $$KA$$ and a weld time of $$...

GATE PI 2003

A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/mi...

GATE PI 2003

A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/mi...

GATE PI 2001

A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/mi...

GATE PI 2001

GATE PI 1995

Two plates with symmetrical $$V$$ joint penetration of $$V$$ angle $$60deg$$ are to be arc welded in a single pass. The power $$P(kW)$$-arc length $$L...

GATE PI 1993

The voltage-arc length characteristics of a power source is $$V=20+40L,$$ where $$V=$$ operating voltage in volts and $$L=$$ arc length in $$cm.$$ The...

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 in $$50$$ $$Hz$$ main supply....

GATE PI 1992

In $$MIG$$ welding the power source characteristics is $${V_p} = 36 - {\rm I}/60$$ and the arc characteristics is $${V_a} = 2{L_a}\,\,\,\, + 27.$$ Fin...

GATE PI 1991

A resistance welder is rated at $$50$$ $$kVA,$$ at $$50\% $$ duty cycle. Secondary voltage is always constant at $$25$$ volts. If a job requires $$150...

GATE PI 1991

The voltage-arc length characteristic of a $$DC$$ arc is given by $$V=20+40L.$$ where $$L=$$ arc length in $$cm.$$ The power source characteristics ca...