When MMA welding what will be the effect on the weld f the power source was changed from AC to DC-ve? a) None b) Higher deposition rate c) It would slightly increase the depth of penetration d) The arc would become unstable

When MMA welding what will be the effect on the weld f the power source was changed from AC to DC-ve?
a) None b) Higher deposition rate
c) It would slightly increase the depth of penetration d) The arc would become unstable
by

1 Answer

Answer :

b) Higher deposition rate
by

Related questions

A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode used was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 250 amps, 24 volts, using DC+ve polarity, and a ROL:of 180mm per min. What would be the arc energy? a) Insufficient information given to calculate the arc energy b) 1.9 kJ/mm c) 1.87 kJ/mm d) 2.0 kJ/mm

Description : A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode used was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 250 amps, 24 volts, using DC ... given to calculate the arc energy b) 1.9 kJ/mm c) 1.87 kJ/mm d) 2.0 kJ/mm

Last Answer : d) 2.0 kJ/mm

The welders have increased the voltage on the SAW welding set, what would be the effect on the weld appearance? a) No effect b) The weld width would be narrower c) The penetration will be increased d) The weld width would be wider

Description : The welders have increased the voltage on the SAW welding set, what would be the effect on the weld appearance? a) No effect b) The weld width would be narrower c) The penetration will be increased d) The weld width would be wider

Last Answer : d) The weld width would be wider

Coating provided on the electrodes used in the arc welding is not expected to (A) Add alloying elements (B) Prevent electrode from contamination (C) Stabilise the arc (D) Provide protective atmosphere to weld

Description : Coating provided on the electrodes used in the arc welding is not expected to (A) Add alloying elements (B) Prevent electrode from contamination (C) Stabilise the arc (D) Provide protective atmosphere to weld

Last Answer : (B) Prevent electrode from contamination

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the (A) Retained austenite (B) Martensite formation (C) Relatively high sulphur content in the base metal (D) Sufficient hydrogen present in the welding arc

Description : Cold cracking in the heat affected zone of a high strength steel weld can take place because of the (A) Retained austenite (B) Martensite formation (C) Relatively high sulphur content in the base metal (D) Sufficient hydrogen present in the welding arc

Last Answer : (B) Martensite formation

When using multiple SAW arc systems (twin wires etc), the arcs often have different polarities or use all AC rather than DC polarity, this is to? a) Prevent arc blow between arcs b) To maximize productivity c) To even out the power factor on the mains supply d) Make it easier to initiate the arc

Description : When using multiple SAW arc systems (twin wires etc), the arcs often have different polarities or use all AC rather than DC polarity, this is to? a) Prevent arc blow between arcs b) To maximize productivity c) To even out the power factor on the mains supply d) Make it easier to initiate the arc

Last Answer : a) Prevent arc blow between arcs

Among gas and electric arc welding, which has the higher rate of heating? a) Gas welding b) Electric arc welding c) Gas welding and electric arc welding have equal rate of heating d) Cannot be determined

Description : Among gas and electric arc welding, which has the higher rate of heating? a) Gas welding b) Electric arc welding c) Gas welding and electric arc welding have equal rate of heating d) Cannot be determined

Last Answer : b) Electric arc welding

During root welding, which of the following would be the main cause of excess penetration? a) The root gap is too small in accordance with WPS b) Preheat not used c) The current is too high d) Root face is too large

Description : During root welding, which of the following would be the main cause of excess penetration? a) The root gap is too small in accordance with WPS b) Preheat not used c) The current is too high d) Root face is too large

Last Answer : c) The current is too high

The required DC voltage for arc welding is- (1) 6 to 9 V (2) 50 to 60 V (3) 200 to 250 V (4) 90 to 100 V

Description : The required DC voltage for arc welding is- (1) 6 to 9 V (2) 50 to 60 V (3) 200 to 250 V (4) 90 to 100 V

Last Answer : (3) 200 to 250 V

Which of the following generators is used for DC arc welding application ?

Description :  Which of the following generators is used for DC arc welding application ? (A) Series generator (B) Shunt generator (C) Differential compound generator (D) Over -compound generator

Last Answer : A

The type of dc generator used for arc welding purposes is a

Last Answer : The type of dc generator used for arc welding purposes is a Differentially compound generator.

What information should be recorded as a minimum, on a completed production weld? a) Size and type of electrode and b) Welding supervisor’s name c) Welder’s Identification, date and weld number d) Welding inspectors name

Description : What information should be recorded as a minimum, on a completed production weld? a) Size and type of electrode and b) Welding supervisor’s name c) Welder’s Identification, date and weld number d) Welding inspectors name

Last Answer : c) Welder’s Identification, date and weld number

t is permissible to allow trainee welder to carry out production welding? a) Never b) Yes as long as the supervisor is happy with his workmanship standard c) Yes as long as he has the approved qualification to cover the intended scope of work d) Yes as long as no NDT is required on the finished weld

Description : t is permissible to allow trainee welder to carry out production welding? a) Never b) Yes as long as the supervisor is happy with his workmanship standard c) Yes as long as he has the approved ... cover the intended scope of work d) Yes as long as no NDT is required on the finished weld

Last Answer : a) Never

What does the term WPQR means? a) Weld productivity quality review b) Weld production quality requirments c) Welding procedure

Description : What does the term WPQR means? a) Weld productivity quality review b) Weld production quality requirments c) Welding procedure

Last Answer : c) Welding procedure

Who determines what the correct weld preparation (root gap, root face, included angle) should be? a) The welding engineer b) The welding supervisor c) The welder will decide d) The inspector will recommend what is suitable

Description : Who determines what the correct weld preparation (root gap, root face, included angle) should be? a) The welding engineer b) The welding supervisor c) The welder will decide d) The inspector will recommend what is suitable

Last Answer : a) The welding engineer

What is a typical ARC voltage setting when welding with the TIG (GTAW) process? a) 18-20V b) 24-26V c) 10-12V d) 70-90V

Description : What is a typical ARC voltage setting when welding with the TIG (GTAW) process? a) 18-20V b) 24-26V c) 10-12V d) 70-90V

Last Answer : c) 10-12V

Compare the AC and DC Arc lamps.

Description : Compare the AC and DC Arc lamps.

Last Answer : AC Arc Lamp DC Arc Lamp Cross section area of electrode is same Cross section area of electrode is positive rod is twice that of negative rod Series inductor is used for stability ... supply is used for DC arc lamp Luminous efficiency is less Luminous efficiency is high

What is the Weld penetration formula?

Description : What is the Weld penetration formula?

Last Answer : What is the answer ?

What do we use for welding on ships? AC or DC?

Description : What do we use for welding on ships? AC or DC?

Last Answer : Ask E/O on your ship.

Compare DC and AC welding on any four points.

Description : Compare DC and AC welding on any four points.

Last Answer : Points DC Welding AC Welding Supply equipment used  DC differential Compound Generator, or Rectifier Welding Transformer Heating Effect Uniform Not Uniform Temperature Obtain ... High, 85% Application Carbon Arc Welding Resistance Welding , Metal Arc Welding

Weld decay can be minimized by specifying steel with: a) Higher carbon level b) higher chromium level c) lower carbon level d) lower chromium level

Description : Weld decay can be minimized by specifying steel with: a) Higher carbon level b) higher chromium level c) lower carbon level d) lower chromium level

Last Answer : c) lower carbon level

In an AC generator, direct current from a separate source is passed through the windings of the rotor _____________. A. by means of slip rings and brushes B. by means of a commutator C. by means of rotating bar magnet D. to minimize the danger of arc over

Description : In an AC generator, direct current from a separate source is passed through the windings of the rotor _____________. A. by means of slip rings and brushes B. by means of a commutator C. by means of rotating bar magnet D. to minimize the danger of arc over

Last Answer : Answer: A

do i need an actual welding table in order to be able to weld?

Description : do i need an actual welding table in order to be able to weld?

Last Answer : Need Answer

welding i want to weld steel bars to my trailer should i use a arch welder or a wire feed welder?

Description : welding i want to weld steel bars to my trailer should i use a arch welder or a wire feed welder?

Last Answer : arch welding is a more stable form of welding. it get hotter and creates a stronger bond

Quantity is not a part of the weld symbol (i)Dark circle (ii) Open circle (iii) Angle of weld (iv)Starting and stopping allowance for welding

Description : Quantity is not a part of the weld symbol (i)Dark circle (ii) Open circle (iii) Angle of weld (iv)Starting and stopping allowance for welding

Last Answer : (iv)Starting and stopping allowance for welding

Term which is not a part of the weld symbol (i) Tail (ii) Arrow (iii) Temperature of welding (iv) None

Description : Term which is not a part of the weld symbol (i) Tail (ii) Arrow (iii) Temperature of welding (iv) None

Last Answer : (iii) Temperature of welding

Quantity which is not a part of the weld symbol (i)Length of welding (ii) Weld is made in the welding shop (iii) Welding is on both sides (iv) Machine used in welding

Description : Quantity which is not a part of the weld symbol (i)Length of welding (ii) Weld is made in the welding shop (iii) Welding is on both sides (iv) Machine used in welding

Last Answer : (iv) Machine used in welding

Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld (D) Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Description : Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the ... of carbon and other element occurs in the weld pool leading to poor properties of the weld

Last Answer : (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

Ratings for welding neck flanges under ASME B16.5 are based upon which of the following? a) The flange thickness and 40,000 psi yield strength. b) The hub thickness at the welding end and 40,000 psi yield strength. c) The weld metal yield strength. d) The piping wall thickness and yield strength.

Description : Ratings for welding neck flanges under ASME B16.5 are based upon which of the following? a) The flange thickness and 40,000 psi yield strength. b) The hub thickness at the welding end and ... psi yield strength. c) The weld metal yield strength. d) The piping wall thickness and yield strength.

Last Answer : b) The hub thickness at the welding end and 40,000 psi yield strength

What is the testing frequency of new AT weld ? (i) Just after the welding (ii) After 7 days of welding (iii) With in the one month of welding* (iv) None of the above

Description : What is the testing frequency of new AT weld ? (i) Just after the welding (ii) After 7 days of welding (iii) With in the one month of welding* (iv) None of the above

Last Answer : iii) With in the one month of welding*

In how many time final grinding should be done of new AT weld ? (i) Just after the welding (ii) After 8 hrs of welding (iii) With in 24 hrs* (iv) None of the above

Description : In how many time final grinding should be done of new AT weld ? (i) Just after the welding (ii) After 8 hrs of welding (iii) With in 24 hrs* (iv) None of the above

Last Answer : iii) With in 24 hrs*

In how many time rough riding should be done of new AT weld ? (i) Just after the welding* (ii) After 8 hrs of welding (iii) After 24 hrs (iv) None of the above

Description : In how many time rough riding should be done of new AT weld ? (i) Just after the welding* (ii) After 8 hrs of welding (iii) After 24 hrs (iv) None of the above

Last Answer : i) Just after the welding*

Weather date of welding is marked on weld? (i) Yes (ii) As decided by the site supervisor (iii) No* (iv) None of the above

Description : Weather date of welding is marked on weld? (i) Yes (ii) As decided by the site supervisor (iii) No* (iv) None of the above

Last Answer : (iii) No*

After AT Welding First train is to be passed after ? (i) 20 Minutes from pouring of weld metal. (ii) 35 Minutes from pouring of weld metal. (iii) 30 Minutes from pouring of weld metal.* (iv) 25 Minutes from pouring of weld metal.

Description : After AT Welding First train is to be passed after ? (i) 20 Minutes from pouring of weld metal. (ii) 35 Minutes from pouring of weld metal. (iii) 30 Minutes from pouring of weld metal.* (iv) 25 Minutes from pouring of weld metal.

Last Answer : (iii) 30 Minutes from pouring of weld metal.*

The skin depth is used to find which parameter? a) DC resistance b) AC resistance c) Permittivity d) Potential

Description : The skin depth is used to find which parameter? a) DC resistance b) AC resistance c) Permittivity d) Potential

Last Answer : b) AC resistance

Weld decay will cause which of the following problems? a) A reduced resistance to corrosion b) a lower tensile strength c) The toughness is reduced d) The hardness will increase

Description : Weld decay will cause which of the following problems? a) A reduced resistance to corrosion b) a lower tensile strength c) The toughness is reduced d) The hardness will increase

Last Answer : a) A reduced resistance to corrosion

The presence of ozone in the stratosphere is responsible for (1) increasing the average global temperature in recent years (2) higher rate of photosynthesis (3) checking the penetration of ultra-violet rays to the earth (4) supplying oxygen for people travelling in jets

Description : The presence of ozone in the stratosphere is responsible for (1) increasing the average global temperature in recent years (2) higher rate of photosynthesis (3) checking the penetration of ultra-violet rays to the earth (4) supplying oxygen for people travelling in jets

Last Answer : checking the penetration of ultra-violet rays to the earth

Argon is used in arc welding because

Description : Argon is used in arc welding because

Last Answer : Argon is used in arc welding because A. low reactivity with metal B. ability to lower the ... of metal C. flammability D. high calorific value

What type of arc welding equipment is necessary when participating in arc welding?

Description : What type of arc welding equipment is necessary when participating in arc welding?

Last Answer : The most important equipment you can have is your safety equipment, your gloves, visor and heavy-duty clothing. You have to have some sort of a power source to generate the electricity necessary for arc welding, so I'd say a power source is your most important arc welding equipment.

In arc welding, Argon is used because of its - (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value

Description : In arc welding, Argon is used because of its - (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value

Last Answer : (1) Low reactivity with metal Explanation: In arc welding, Argon is used as a shielding gas because it is chemically inert and forms no compounds. At the high temperatures that welding requires, the ... to brittle welds and instability in the welding arc. So,argon and other inert gases are sprayed.

Projection welding is (i) Electric arc welding (ii) Gas welding (iii)Spot welding (iv) None

Description : Projection welding is (i) Electric arc welding (ii) Gas welding (iii)Spot welding (iv) None

Last Answer : (iv) None

Which type of welding is generally used in automobile sector? a) Electric arc welding b) Electric resistance welding c) Gas welding d) Forge welding

Description : Which type of welding is generally used in automobile sector? a) Electric arc welding b) Electric resistance welding c) Gas welding d) Forge welding

Last Answer : b) Electric resistance welding

Rails in the field are generally welded by using a) Thermit welding b) Gas welding c) Electric arc welding d) Forge welding

Description : Rails in the field are generally welded by using a) Thermit welding b) Gas welding c) Electric arc welding d) Forge welding

Last Answer : a) Thermit welding

The electric arc welding is a type of ............. welding. (a) forge (b) fusion

Description : The electric arc welding is a type of ............. welding. (a) forge (b) fusion

Last Answer : b) fusion

Consumable electrodes are used in the __________ welding. (A) Gas (B) Arc (C) Thermit (D) Resistance

Description : Consumable electrodes are used in the __________ welding. (A) Gas (B) Arc (C) Thermit (D) Resistance

Last Answer : (B) Arc

Projection welding & stud welding is categorised as the __________ welding. (A) Pressure (B) Thermit (C) Resistance (D) Arc

Description : Projection welding & stud welding is categorised as the __________ welding. (A) Pressure (B) Thermit (C) Resistance (D) Arc

Last Answer : C) Resistance

Which of the following mainly decides the current to be employed is arc welding? (A) Electrode size (B) Plate thickness (C) Voltage across the arc (D) Welded portion length

Description : Which of the following mainly decides the current to be employed is arc welding? (A) Electrode size (B) Plate thickness (C) Voltage across the arc (D) Welded portion length

Last Answer : (A) Electrode size

Stainless steel is welded using (A) Oxy-acetylene flame (B) Oxy-hydrogen flame (C) Arc welding (D) Inert gas arc welding

Description : Stainless steel is welded using (A) Oxy-acetylene flame (B) Oxy-hydrogen flame (C) Arc welding (D) Inert gas arc welding

Last Answer : (D) Inert gas arc welding

Explain the shielded metal arc welding (SMAW) processes with neat sketch. State its two advantages and disadvantages.

Description : Explain the shielded metal arc welding (SMAW) processes with neat sketch. State its two advantages and disadvantages.

Last Answer : Working  : Shielded metal arc welding uses a metallic consumable electrode of a proper composition for generating arc between itself and the parent work piece. The molten electrode metal fills the weld ... . 2. Weld may contain slag inclusions 3. Fumes make difficult the process control.

List common equipments used for arc welding process.

Description : List common equipments used for arc welding process.

Last Answer : 1. A.C. or D.C. machine 2. Electrode (bare or coated) 3. Electrode Holder 4. Cables and its connectors 5. Chipping Hammer 6. Earthing Clamps 7. Wire-brush 8. Helmet 9. Safety Goggles 10. Hand Gloves 11. Apron Sleeves etc.