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radiographic testing in dibrugarh
 
 
 
Radiographic Testing (RT), or industrial radiography, is a nondestructive testing (NDT) method of inspecting materials for hidden flaws by using the ability of shortwavelength electromagnetic radiation (high energy photons) to penetrate various materials.

Either an X-ray machine or a radioactive source, like Ir-192, Co-60, or in rarer cases Cs-137 are used in a X-ray computed tomography machine as a source of photons.Neutron radiographic testing (NR) is a variant of radiographic testing which uses neutrons instead of photons to penetrate materials. This can see very different things from X-rays, because neutrons can pass with ease through lead and steel but are stopped by plastics, water and oils.

Since the amount of radiation emerging from the opposite side of the material can be detected and measured, variations in this amount (or intensity) of radiation are used to determine thickness or composition of material. Penetrating radiations are those restricted to that part of the electromagnetic spectrum of wavelength less than about 10nanometres.

 
The beam of radiation must be directed to the middle of the section under examination and must be normal to the material surface at that point, except in special techniques where known defects are best revealed by a different alignment of the beam. The length of weld under examination for each exposure shall be such that the thickness of the material at the diagnostic extremities, measured in the direction of the incident beam, does not exceed the actual thickness at that point by more than 6%. The specimen to be inspected is placed between the source of radiation and the detecting device, usually the film in a light tight holder or cassette, and the radiation is allowed to penetrate the part for the required length of time to be adequately recorded.

The result is a two-dimensional projection of the part onto the film, producing a latent image of varying densities according to the amount of radiation reaching each area. It is known as a radio graph, as distinct from a photograph produced by light. Because film is cumulative in its response (the exposure increasing as it absorbs more radiation), relatively weak radiation can be detected by prolonging the exposure until the film can record an image that will be visible after development. The radiograph is examined as a negative, without printing as a positive as in photography. This is because, in printing, some of the detail is always lost and no useful purpose is served.

Before commencing a radiographic examination, it is always advisable to examine the component with one's own eyes, to eliminate any possible external defects. If the surface of a weld is too irregular, it may be desirable to grind it to obtain a smooth finish, but this is likely to be limited to those cases in which the surface irregularities (which will be visible on the radio graph) may make detecting internal defects difficult.

After this visual examination, the operator will have a clear idea of the possibilities of access to the two faces of the weld, which is important both for the setting up of the equipment and for the choice of the most appropriate technique.

Defects such as delaminations and planar cracks are difficult to detect using radiography, particularly to the untrained eye. Without overlooking the negatives of radiographic inspection, Radiography does hold many significant benefits over ultrasonics, particularly insomuch that as a 'picture' is produced, more accurate identification of the defect can be made, and by more interpreters. Very important as most construction standards permit some level of defect acceptance, depending on the type and size of the defect.

To the trained Radiographer, subtle variations in visible film density provide the technician the ability to not only accurately locate a defect, but identify its type, size and location; an interpretation that can be physically reviewed and confirmed by others, possibly eliminating the need for expensive and unnecessary repairs.

 
Radiographic Testing - Benefits
 
  • Can inspect assembled components
  • Minimum surface preparation required
  • Detects both surface and subsurface defects
  • Provides a permanent record of the inspection
  • Verify internal flaws on complex structures
  • Isolate and inspect internal components
  • Automatically detect and measure internal flaws
  • Measure dimensions and angles within the sample
  • without sectioning
  • Sensitive to changes in thickness, corrosion, flaws and material density changes

Radiographic Testing - Application
 
Radiographic Testing is widely used in the;
  • Aerospace industries
  • Military defence
  • Offshore industries
  • Marine industries
  • Power-gen industries
  • Petrochem industries
  • Waste Management
  • Automotive industries
  • Manufacturing industries
  • Transport industries
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    andaman and nicobar islands | andhra pradesh | arunachal pradesh | assam | bihar | chandigarh | chhattisgarh | delhi | goa | gujarat | haryana | himachal pradesh | jdibrugarh and kashmir | jharkhand | karnataka | kerala | ladakh | lakshadweep | madhya pradesh | maharashtra | manipur | meghalaya | mizoram | nagaland | odisha | puducherry | punjab | rajasthan | sikkim | tamil nadu | telangana | the dadra and nagar haveli and daman and diu | tripura | uttarakhand | uttar pradesh | west bengal ...
     
    list of our services following districts
     
    alipurduar - i | alipurduar - ii | amdanga | amta - i | amta - ii | arambag | arsha | ausgram - i | ausgram - ii | baduria | bagda | bagmundi | bagnan - i | bagnan - ii | balagarh | balarampur | bally jagachha | balurghat | bamangola | bankura - i | bankura - ii | bansihari | barabani | barabazar | barasat - i | barasat - ii | barjora | barrackpur - i | barrackpur - ii | baruipur | basanti | basirhat - i | basirhat - ii | beldanga - i | beldanga - ii | berhampore | bhagawangola - i | bhagawangola - ii | bhagawanpur - i | bhagawanpur - ii | bhangar - i | bhangar - ii | bharatpur - i | bharatpur - ii | bhatar | binpur - i | binpur - ii | bishnupur - i | bishnupur - ii | bolpur sriniketan | bongaon | budge budge - i | budge budge - ii | bundwan | burdwan - i | burdwan - ii | burwan | canning - i | canning - ii | chakdah | chanchal - i | chanchal - ii | chandipur | chanditala - i | chanditala - ii | chandrakona - i | chandrakona - ii | chapra | chhatna | chinsurah - magra | chopra | contai - i | contai - iii | cooch behar - i | cooch behar - ii | dantan - i | dantan - ii | darjeeling pulbazar | daspur - i | daspur - ii | debra | deganga | deshopran | dhaniakhali | dhupguri | diamond harbour - i | diamond harbour - ii | dinhata - i | dinhata - ii | domjur | domkal | dubrajpur | egra - i | egra - ii | english bazar | falakata | falta | farakka | faridpur durgapur | gaighata | galsi - i | galsi - ii | gangajalghati | gangarampur | garbeta - i | garbeta - ii | garbeta - iii | gazole | ghatal | goalpokhar - i | goalpokhar - ii | goghat - i | goghat - ii | gopiballavpur - i | gopiballavpur - ii | gorubathan | gosaba | habibpur | habra - i | habra - ii | haldia | haldibari | hanskhali | hariharpara | haringhata | haripal | harirampur | harischandrapur - i | harischandrapur - ii | haroa | hasnabad | hemtabad | hilli | hingalganj | hirbandh | hura | illambazar | indpur | indus | islampur | itahar | jagatballavpur | jaipur | jalangi | jalpaiguri | jamalpur | jamboni | jamuria | jangipara | jaynagar - i | jaynagar - ii | jaypur | jhalda - i | jhalda - ii | jhargram | jorebunglow sukiapokhri | kakdwip | kalchini | kaliachak - i | kaliachak - ii | kaliachak - iii | kaliaganj | kaliganj | kalimpong -i | kalimpong - ii | kalna - i | kalna - ii | kalyani | kandi | kanksa | karandighi | karimpur - i | karimpur - ii | kashipur | katwa - i | katwa - ii | keshiary | keshpur | ketugram - i | ketugram - ii | khanakul - i | khanakul - ii | khandaghosh | kharagpur - i | kharagpur - ii | khargram | kharibari | khatra | khejuri - i | khejuri - ii | khoyrasol | kolaghat | kotulpur | krishnaganj | krishnagar - i | krishnagar - ii | kulpi | kultali | kumarganj | kumargram | kurseong | kushmundi | labpur | lalgola | lava | madarihat | magrahat - i | magrahat - ii | mahisadal | mal | maldah (old) | manbazar - i | manbazar - ii | mandirbazar | mangolkote | manikchak | manteswar | mathabhanga - i | mathabhanga - ii | mathurapur - i | mathurapur - ii | matiali | matigara | maynaguri | mayureswar - i | mayureswar - ii | mejhia | mekliganj | memari - i | memari - ii | midnapore | minakhan | mirik | mohammad bazar | mohanpur | moyna | murarai - i | murarai - ii | murshidabad jiaganj | nabadwip | nabagram | nagrakata | nakashipara | nalhati - i | nalhati - ii | namkhana | nanda kumar | nandigram - i | nandigram - ii | nanoor | narayangarh | nawda | naxalbari | nayagram | neturia | onda | ondal | panchla | pandabeswar | pandua | panskura | para | patharpratima | patrasayer | pedong | phansidewa | pingla | polba - dadpur | potashpur - i | potashpur - ii | puncha | purbasthali - i | purbasthali - ii | pursura | purulia - i | purulia - ii | raghunathganj - i | raghunathganj - ii | raghunathpur - i | raghunathpur - ii | raiganj | raina - i | raina - ii | raipur | rajarhat | rajganj | rajnagar | ramnagar - i | ramnagar - ii | rampurhat - i | rampurhat - ii | ranaghat - i | ranaghat - ii | rangli rangliot | ranibundh | raniganj | raninagar - i | raninagar - ii | ratua - i | ratua - ii | sabang | sagar | sagardighi | sahid matangini | sainthia | salanpur | salbani | saltora | samserganj | sandeshkhali - i | sandeshkhali - ii | sankrail | sankrail | santipur | santuri | sarenga | serampur uttarpara | shyampur - i | shyampur - ii | simlapal | singur | sitai | sitalkuchi | sonamukhi | sonar pur | suri - i | suri - ii | sutahata | suti - i | suti - ii | swarupnagar | taldangra | tamluk | tapan | tarakeswar | tehatta - i | tehatta - ii | thakurpukur mahestola | tufanganj - i | tufanganj - ii | udaynarayanpur | uluberia - i | uluberia - ii | vishnupur ...
     
    list of our services following districts
     
    car nicobar | diglipur | ferrargunj | great nicobar | little andaman | mayabunder | nancowry | port blair | rangat | aalo hq | anelih | anini | bagra circle | balemu circle | balijan adc | bameng adc | bana eac | banderdewa circle | baririjo circle | basar adc | bhalukpong eac | bilat circle | boleng adc | bomdila hq | bongkhar circle | bordumsa adc | borduria circle | borum | buragaon eac | chaglagam circle | chambang circle | changlang hq | chayangtajo adc | chetam peer yapu circle | chongkham eac | dadam circle | dambuen circle | dambuk adc | damin circle | daporijo hq | darak circle | daring circle | debeyar co circle | deed circle | deomali adc | desali circle | dirang adc | dissing passo circle | diyun eac | doimukh sdo | dollungmukh circle | dudunghar circle | dumporijo adc | etalin | gangte circle | geku eac | gelling circle | gensi eac | gepen circle | giba circle | gite ripa circle | goiliang circle | gumto circle | gyawe purang circle | hawai hq | hayuliang adc | hunli sdo | itanagar eac | jairampur adc | jamiri circle | jang adc | jengging circle | jomlo mobuk circle | kakoi circle | kalaktang adc | kamba adc | kamengbari doimara circle | kamporijo circle | kangku circle | kantang circle | kanubari adc | katan circle | katang circle | kaying eac | kebang circle | kharsang circle | khenawa circle | khimiyang eac | khonsa hq | kibithoo circle | kimin sdo | kitpi circle | koloriang hq | kombo circle | kora circle | koronu circle | koyu eac | kronli (arzoo circle) | lada circle | laju sdo | lathao circle | lawnu circle | lekang mahadevpur circle | leporiang circle | lhou circle | likabali sdo | limeking circle | liromoba eac | longding hq | longo circle | lumla adc | lyngok longtoi circle | manchal circle | manmao eac | mariyang adc | maro circle | mebo adc | mechuka adc | mengio eac | metengliang circle | miao adc | migging circle | mipi | monigong eac | mopom adipasi circle | mukto circle | nacho sdo | nafra eac | naharlagun eac | nampong sdo | namsai hq | namsing circle | namtok eac | nari adc | new seren circle | nikte kodum circle | nilling circle | nyapin adc | nyobia circle | old ziro sdo | oyan circle | pakke kessang eac | pakoti circle | palin circle | palling circle | pangchao sdo | pangin eac | parang circle | parbuk sdo | pasighat hq | passa valley circle | patuk adc | payeng circle | payum circle | phassang circle | pidi circle | pipsorang circle | pipu dipu circle | pistana circle | piyong circle | pizirang veo circle | polosang circle | puchi geko circle | pumao circle | raga adc | rebo perging circle | renuk circle | richukrong circle | riga eac | roing hq | ruksin adc | rumgong adc | rupa sdo | sagalee adc | sago | sangdupota basar nello circle | sangram sdo | sarli circle | sawa circle | segi gusar circle | seijosa adc | seppa hq | shergaon circle | sibe circle | silsango circle | singa circle | singchung adc | siyum adc | soha circle | sunpura circle | taksing circle | tali adc | taliha adc | tarak lengdi cicle | taraso circle | tato eac | tawang hq | tezu hq | thembang circle | thingbu circle | thrizino adc | tikhak rima putok circle | tinali paglam circle | tirbin eac | toru circle | tuting adc | vijoynagar eac | wakka sdo | wakro circle | walong circle | yachuli adc | yangte circle | yatdam circle | yazali circle | yingkiong circle | yomcha adc | zemithang circle | ziro hq | agamoni | algapur | amguri | athani | azara | badarpur | baganpara (pt) | baghbor | bagribari (pt) | bajali (pt) | balijana | banekuchi | barama pt | barbhag | barkhetri | barnagar (pt) | barpeta | baska | bengtol | bhowraguri | bhuragaon | bihpuria | bijni (pt) | bilasipara pt | biswanath | boitamari | bokakhat | boko | bongaigaon (pt) | chabua | chamaria | chandrapur | chapar pt | chariduar | chenga | chhaygaon | dalgaon (pt) | dangtal revenue circle | dergaon | dhakuakhana (pt-i) | dhekiajuli (pt) | dhemaji | dhing | dhubri | dibrugarh east | dibrugarh west | dimow | diphu | dispur | doboka | donka | doom dooma | dotoma | dudhnai | gauripur | ghograpar (pt) | gogamukh | gohpur | golaghat | golakganj pt | goreswar (pt) | goroimari | gossaigaon (pt) | guwahati | haflong | hailakandi | hajo | harisinga | helem | hojai | jalah (pt) | jonai | jorhat east | jorhat west | kadam | kalaigaon | kalgachia | kaliabor | kamalpur | kampur | karimganj | katigora | katlichara | khoirabari | khumtai | kokrajhar | koya | laharighat | lakhipur | lakhipur | lala | lanka | mahmora | majuli | mangaldoi (pt) | mankachar | margherita | mariani | marigaon | matia | mayong | mazbat | mikirbheta | moran | morangi | na-duar | nagaon | nagarbera | naharkatiya | nalbari | naobaicha | narayanpur | nazira | nilambazar | north guwahati (pt) | north lakhimpur | pachim nalbari | palasbari | patharkandi | pathorighat (pt) | phuloni | raha | ramkrishna nagar | rangia pt | rangjuli | rupahi | sadiya | samaguri | sapekhati | sarthebari | sarupathar | sarupeta (pt) | sibsagar | sidli (pt) | silchar | silonijan | sipajhar | sissibargaon | sonai | sonapur | sonari | sonari | south salmara | srijangram | subansiri (pt-i) | tamulpur | tengakhat | teok | tezpur | thelamara | tihu (pt) | tingkhong | tinsukia | titabor | udalguri | udarbond | ujani majuli circle | bishnupur | borobekra | bungte chiru | chakpikarong | champhai | chandel | chilivai phaibung | chingai | churachandpur | haochong | henglep | island | jessami | jiribam | kakching | kamjong | kangchup geljang | kangpokpi | kangvai | kasom khullen | keirao bitra | khengjoy | khoupum | lamphelpat | lamsang | lhungtin | lilong | lm | longmai | machi | moirang | moreh | mualnuam | nambol | nungba | paomata | patsoi | phungyar | porompat | purul | sahamphung | saikot | saikul | saitu-gamphazol | samulamlan | sangaikot | sawombung | singngat | song song | suangdoh | tadubi | tamenglong | tamenglong north | tamenglong west | tengnoupal | thanlon | thoubal | tipaimukh | tuibong | t vaichong | ukhrul | vangai range | waikhong | wangoi | willong | amlarem | baghmara | bajengdoba | betasing | bhoirymbong | chokpot | dadenggiri | dalu | damalgre | dambo rongjeng | demdema | gambegre | gasuapara | jirang | kharkutta | khatarshnong laitkroh | khliehriat | laskein | mairang | mawkynrew | mawkyrwat | mawlai | mawpat | mawphlang | mawryngkneng | mawshynrut | mawsynram | mawthadraishan | mylliem | nongstoin | pynursla | ranikor | resubelpara | rongara | rongram | saipung | samanda | selsella | shella bholaganj | sohiong | songsak | thadlaskein | tikrikilla | umling | umsning | zikzak | aibawk | bilkhawthlir | champhai | chawngte | darlawn | east lungdar | hnahthial | khawbung | khawzawl | lawngtlai | lunglei | lungsen | ngopa | 'n' thingdawl | phullen | reiek | saiha | sangau | s' bungtlang | serchhip | thingsulthliah | tlangnuam | tuipang | west bunghmun | west phaileng | zawlnuam | aboi | aghunato | aitepyong | akuhaito | akuluto | alongkima | amahator | angjangyang | aquqhnaqua | asuto | athibung | atoizu | baghty | bhandari | botsa | changpang | changtongya | chare | chen | chessore | chetheba | chiephobozou | chingmei | chizami | chozuba | chuchuyimlang | chukitong | chumukedima | chunlikha | dhansiripar | dimapur sadar | englan | ghathashi | hunta | jakhama | jalukie | kebai khelma | kezocha | khezhakeno | khongsa | khuza | kikruma | kiphire sadar | kiusam | kohima sadar | kubolong | kuhoboto | longchem | longkhim | longleng | longmatra | longshen | lotsu | mangko | mangkolemba | medziphema | meluri | merangmen | mon sadar | monyakshu | mopong | naginimora | namsang | ngoungchung | nihokhu | niuland | nokhu | noklak | noksen | nsong | ongpangkong | ongpangkong (n) | panso | pedi (ngwalwa) | peren | pfutsero | phek sadar | phokhungri | phomching | phor | pughoboto | pungro | ralan | razieba | sakraba | sakshi | sangsangnyu | sanis | saptiqa | satakha | satoi | sechu-zubza | sekruzu | seyochung | shamator | shangnyu | sitimi | sotokur | sungro | suruhuto | tamlu | tening | thonoknyu | tizit | tobu | tokiye | tseminyu | tsogin | tsurangkong | tsurungto | tuensang sadar | tuli | v.k. | wakching | weziho | wokha sadar | wozhuro | yongnyah | zuketsa | zunheboto sadar | chungthang | dentam | dzongu | gangtok | gyalshing | jorethang | kabi | mangan | namchi | pakyong | rangpo | ravong | rongli | soreng | yangang | yuksom | amarpur | ambassa | belonia | bishalgarh | dharmanagar | gandacherra | jampuijala | jirania | kailashahar | kamalpur | kanchanpur | karbook | khowai | kumarghat | longtharai valley | mohanpur | panisagar | sabroom | sadar | santirbazar | sonamura | teliamura | udaipur ...