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Metal Arc
When ‘hydrogen control’ is specified for a manual metal arc welding project the electrode would normally be: a. Cellulose b. Iron oxide c. Acid d. asic When manual metal arc welding is being carried out on an open construction site! which group of welders are most li"ely to re#uire continuous monitoring$ a. Concrete shuttering welding teams b. %ipe welding teams c. %late welders d. %lant maintenance welders &ou notice manual metal arc electrodes! stripped of flux! are being used as filler wire for 'I( welding. &ou &ou would object because: a. It is too expensi)e b. 'he wire would be be too thic" c. 'he metal composition may be wrong d. 'he wire is too short When open site wor"ing! serious porosity in metal arc welds is brought to your attention. What would you in)estigate$ a. *lectrode type b. %ower plant type c. *lectrode storage d. +ay temperature . 'he use of flux with gas shielded metal arc welding allows: a. ,heet metal to be welded b. A stable arc when using high current densities c. Aluminium to be welded d. -ess dilution of the weld by the parent metal 'he )oltage necessary to maintain an arc during metal arc welding is termed: a. ains supply )oltage b. Arc Arc current c. Arc )oltage d. /pen circuit )oltage When manual metal arc welding low carbon steel! which electrode co)ering will gi)e the greatest degree of penetration$ a. Iron powder. b. 0utile.
c. Cellulosic. d. -ow hydrogen Tig
When 'I( welding austenitic stainless steel pipe! argon gas bac"ing is called for. 'his is to: a. %re)ent oxidation b. %re)ent underbead crac"ing c. %re)ent porosity d. Control the penetration bead shape . Inherent rectification of the electrical output is produced in the arc when 'I( welding using: a. AC with a suppressor b. AC without a suppressor c. +C with re)erse polarity d. +C with straight polarity When referring to 'I( welding! the shielding gas could be: a. Argon and hydrogen. b. Argon and helium. c. Argon and nitrogen. d. All the abo)e. Which defect would you expect to get in 'I( welds in non1deoxidised steel$ a. 2ndercut. b. %orosity. c. 'ungsten inclusions. d. -inear misalignment. Argon purging on the root side is necessary in the 'I( welding of stainless steel to: a. /btain full penetration. b. /btain full fusion. c. A)oid porosity in the root. d. /btain a satisfactory weld surface finish. When 'I( welding austenitic stainless steel pipe! argon gas bac"ing is called for. 'his is to: a. %re)ent oxidation b. %re)ent underbead crac"ing c. %re)ent porosity d. Control the penetration bead shape MIG
I( welding tends to be susceptible to lac" of fusion problems. 'his is because of: a. %oor maintenance of e#uipment b. Incorrect settings
c. %oor inter1run cleaning d. All the abo)e A common gas mixture used in I( welding nic"el alloys! to combine good le)els of penetration with good arc stability would be: a. 3445 C/6 b. 3445 argon c. 745 argon and 645 C/6 d. 875 argon and 65 oxygen When referring to I( welding! the shielding gas would be: a. Argon. b. Argon 9 35 oxygen. c. Argon 9 645 carbon dioxide. d. one of the abo)e. Submerge
,ubmerged arc utilises: a. +eep penetration characteristic. b. ;igh deposition rates on +C9. c. welding only. d. one of the abo)e. Which of the following is li"ely to gi)e the highest impact strength in ferritic weld metal$ a. Cellulosic electrodes. b. ,ubmerged arc with acid flux. c. ,pray transfer C/6 welding. d. asic coated A electrodes. .
,ubmerged arc welds made with re1cycled flux are liable to: a. %orosity. b. Course grain si?e. c. 2ndercut. d. Incomplete penetration In submerged arc welding the use of excessi)ely high )oltage would result in: a. Insufficient flux melting b. *xcessi)e flux melting c. ,lag remo)al difficulties d. ,patter ,ubmerged arc fluxes can be supplied in two forms. 'hese are: a. ,intered and agitated
b. Agitated and fused c. ,intered and agglomerated d.
In A welding what parameter is used for control of penetration into the base material$ a. @oltage b. Welding speed c. Iron powders in the coating d. Current
. In A welding! the slags produced can be )aried to suit the welding position. Which type of slag would be re#uired for welding in the ;@ position$ a.
o)ement of the arc in A welding by magnetic forces is called: a. Arc de)iation
b. Arc misalignment c. Arc blow d. Arc eye
When A welding low carbon steel which electrode will gi)e the greatest deposition rate$ a. ;ydrogen controlled b. Cellulosic c. 0utile d. Iron powder
A welding of low alloy steels is more li"ely to be performed with: a. 0utile electrodes. b. Cellulosic electrodes. c. Iron powder electrodes. d. asic hydrogen controlled electrodes.
'he permanent bac"ing material for A welding of low carbon steel should be made from: a. Copper. b. -ow carbon steel. c. ' steel. d. Cast iron.
. In positional A welding on pipewor"! welders are ha)ing difficulty in obtaining good capping profiles when welding in the o)erhead position. Would you: a. Ad)ise them to increase the current. b. Ad)ise them to increase the )oltage. c. As" for a new welding team. d. ,uggest the use of a smaller diameter electrode.
A welds made with damaged electrode coatings are subject to: a. %orosity. b. 2ndercut. c. *xcessi)e penetration. d. *xcessi)e bead height.
HAZ
Which physical test is more li"ely to re)eal ;AB embrittlement$ a. 'rans)erse tensile. b. All weld tensile. c. 0oot bend. d. Charpy impact.
Which of the following tests would indicate the toughness of weld metalparent metal 1 ;AB$ a. acro b. ic" brea" c. ;ardness d. Charpy )ee notch
Welding a steel plate with a C* of 4.DE would re#uire preheating to: a. %re)ent the formation of sulphides b. %re)ent hardening in the ;AB c. %re)ent the formation of carbides d. 'o impro)e mechanical properties in the weld &ou ha)e a macro section of a F'F butt joint that shows a step1li"e defect lying outside the )isible ;AB. What would this defect possibly signify$ a. ;AB crac"ing. b. 'oe crac"ing. c. -amination. d. -amellar tearing.
Electrodes
. Cellulosic electrodes are often used when welding the root pass of pipes in the field because: a. ;ydrogen control is needed b. 'here are iron powders in the electrode c. ;igher arc )oltage can be obtained d. ,horter arc length can be obtained Austenitic stainless steel electrodes are generally smaller in length than mild steel electrodes because: a. ;igh amperage is used b. ,helf life will be decreased c. 'heir electrical conducti)ity is less than that of steel d. 'hey are more expensi)e
'he electrodes for welding low alloy steels should be: a. 2sed with a low current )alue. b. /ne si?e larger than for general purpose electrodes.
c. 2sed for welding in the flat position only. d. ;eated in a drying o)en before use.
Preheat
%reheating for arc welding applies to: a. Assembly welding only b. Assembly and tac" welding c. Goints o)er 6E mm thic" only d. Cruciform welds only
. Which one of the following statements is correct$ a. %reheating increases hardness b. %reheating increases cooling c. %reheating increases dilution d. %reheating increases shrin"age stress %reheating and interpass heating are used primarily for: a. Aiding fusion. b. 0educing hydrogen content of weld preparation prior to welding. c. *nsure a fine grain si?e. d. ,low down the cooling rate after welding.