Heats School of Welding Technology Inc. – Tarlac City

How many Welding Processes so far in the Industry? What are they?

In Arc Welding Processes, it is subdivided into following processes;

1. Atomic Hydrogen Welding (AHW)
2. Bare Metal ARc Welding (BMAW)
3. Carbon Arc Welding (CAW)
-gas (CAW-G)
-shielded (CAW-G)
-twin (CAW-T)
4. Electroslag Welding (EGW)
5. Flux Cored Arc Welding (FCAW)
6. Gas Metal Arc Welding (GMAW)
-pulsed arc (GMAW-P)
-short circuiting arc (GMAW-S)
7. Gas Tungsten Arc Welding (GTAW or TIG)
– pulsed arc (GTAW-P)
8. Plasma Arc Welding (PAW)
9. Shielded Metal Arc Welding (SMAW)
10. Stud Arc Welding (SW)
11. Submerged Arc Welding (SAW)
-series (SAW-S)

What are the types of weld?

What are the types of Joints?

What are the causes of Porosities?

What are the causes of Hydrogen Cracking?

How to avoid Hydrogen Cracking?

What are the types of Testing?

What are the Non-Destructive Testig Methods?

What are the Principles of these NDT MEthods?

Principle of Magnetic Particle Testing

A magnetic field is established in a component made from ferromagnetic material. The magnetic lines of force travel through the material, and exit and reenter the material at the poles. Defects such as crack or voids cannot support as much flux, and force some of the flux outside of the part. Magnetic particles distributed over the component will be attracted to areas of flux leakage and produce a visible indication.

Principle of Radiographic Testing

X-rays are used to produce images of objects using film or other detector that is sensitive to radiation. The test object is placed between the radiation source and detector. The thickness and the density of the material that X-rays must penetrate affects the amount of radiation reaching the detector. This variation in radiation produces an image on the detector that often shows internal features of the test object.

Advantages and Dis-advantages of these NDT Methods

Penetrant Testing
ADVANATAGES
Large surface areas or large volumes of parts/materials can be inspected rapidly and at low cost.

Parts with complex geometry are routinely inspected.

Indications are produced directly on surface of the part providing a visual image of the discontinuity.

Equipment investment is minimal.

DISADVANTAGES
Detects only surface breaking defects.

Surface preparation is critical as contaminants can mask defects.

Requires a relatively smooth and nonporous surface.

Post cleaning is necessary to remove chemicals.

Requires multiple operations under controlled conditions.

Chemical handling precautions are necessary (toxicity, fire, waste).

Ultrasonic Testing

ADVANTAGES
Depth of penetration for flaw detection or measurement is superior to other methods.

Only single sided access is required.

Provides distance information.

Minimum part preparation is required.

Method can be used for much more than just flaw detection.

DISADVANTAGES
Surface must be accessible to probe and couplant.

Skill and training required is more extensive than other technique.

Surface finish and roughness can interfere with inspection.

Thin parts may be difficult to inspect.

Linear defects oriented parallel to the sound beam can go undetected.

Reference standards are often needed.

Radiographic Testing

ADVANTAGES
Can be used to inspect virtually all materials.

Detects surface and subsurface defects.

Ability to inspect complex shapes and multi-layered structures without disassembly.

Minimum part preparation is required.

DISADVANTAGES
Extensive operator training and skill required.

Access to both sides of the structure is usually required.

Orientation of the radiation beam to non-volumetric defects is critical.

Field inspection of thick section can be time consuming.

Relatively expensive equipment investment is required.

Possible radiation hazard for personnel.

Thanks Juliet. This section of our website is really for technical question. You can post your questions here about welding technology and we will try to answer it as far as we know.

hello sonsaw, thanks for coming by

Hi Teddy, thanks for coming by. I already emailed you the details. Thank you.

Hi shafy thanks for coming by. please refer to ASME IX. its very straight forward. thanks

A plate welder is a welder who is only qualified to weld on plates/structures at 1F, 2F, 3F, 4F, 1G, 2G, 3G and 4G position.

Hi Deo, thanks for coming by. sa ngayon ala pa kaming night shift kasi ikaw pa lang nag inquire about night shift. taga saan ka ba Deo? dito ka lang ba sa Tarlac?

Hi Marlon, pwede ka mag take ng WQT kaht SMAW NC I lang natapos mo, ang qualification mo nga lang ay Plate Welder (3G or 4G) pero dapat maipasa mo ang test bago ka makakuha ng WQT. May CSWIP WQT kami (UK Certification) pero P9,500/WQT ang bayad at may schedule kami sa April 5, 2010. Pero dapat talagang ready ka para di sayang ang pera mo. Kasi di ka makakakuha ng WQT kung babagsak ka sa assessment. Regards,

di pa po ako nakakita pero marami na pong auto darkening welding mask dito

Hi Zeus, thanks for your interest sa courses namin.
Pwede ka naming gawing maging MAHUSAY na welder. Ngunit dahil ala ka pang experience sa larangan ng welding, kailangan mo ng mag-umpisa sa una.
1st step: Kunin mo ang SMAW NC I – 268 hrs (34 days) – P12,000 o para makatipid ka, kunin mo ang Basic Welding Course – 6 days – P5,000. Pre-requisite, none
2nd step: Kunin mo ang SMAW NC II -268 hrs (34 days) – P22,000 – Pre-requisite, SMAW NC I or Basic Welding Course.
3rd step: Kunin mo ang GTAW NC II – 268 hrs (34 days) – P30,000 – Pre-requisite, SMAW NC II
4th step: Apply ka as a welder kahit saang fabrication firms sa Pinas
5th step: Pag may 2 years experience ka na, apply ka na sa abroad and that will be teh start of your highly paid welding career.
Regards,

Hi Danilo, you can enroll anytime. We have a weekly schedule available. thanks

Hi Glen. You are qualified to take our welding inspector’s course. Actually engineering graduates or 3rd year engineering ang prefered lang namin kasi mas madaling pumasok as welding inspector kugn graduate ka ng engineering. May risk ka nga lang sa pagsisimula ng welding inspector career dahil iba ang kurso mo. pero lahat naman nagsisimula sa zero kaya okay lang. Suggestion ko, pagkakuha mo ng welding inspector course namin, kuha ka rin ng NDT Courses then mag apply ka as NDT Assistant sa mga NDT Companies as a start for your welding inspection career.

Both are in demand. Welding Inspector ay mas mataas ang sahod

SMAW NC I – P12,000
SMAW NC II – P22,000
GTAW NC II – P30,000

dito lang po kami sa Tarlac eh. ok naman po dito dahil libre ang boarding house at mura ang tuition fee

Hi Mohamed, we can do that service for you. regards

Our Coating Inspector for 2011 will be done in a monthly basis every 2nd week of any month.
Our Welding Inspector will be on Jan 3-7, June 2011 and Dec 2011.

Regards

Hi, dahil no welding background ka, simula ka sa Basic Welding (6 day @ P6,000) or SMAW NCI (34 days @ P12,000) then take SMAW NCII (34 days P21,000) then take GTAW NCII (34 days @ P34,000).

Thanks

hello, meron po. monday to saturday po enrollment namin. every lunes ang simula ng klase. thanks

Wala pa po kmi schedule kasi nhirapan kmi last year sa pagbuo ng participants. Kokonti po kc mga enolees. Under review po ulit

Non Destructive Testing