What is Quality?

From the ISO 8402 Definition

Quality is:

The totality of characteristics of an item that bear on its ability to satisfy stated and implied needs

Lamellar tearing

Occurence of step-like crack. This problem involves poor "through thickness" ductility and visually occurs in tee or corner joints thick ferritic steels where high shrinkage starins act through the plate thickness in combination with parent metal inclusion.

What is Film Artefacts?

Film artefacts are images form during radiography and film processing which are not a defect or a change in component thickness.

Example of film artefacts are;

Streakiness
Crimp Marks
Drying Marks
Diffraction Mottling
Dirty Intensifying Screens
Static Marks
Solarization
Reticulation
Chemical Splashes
Water splashes

Causes of Weld Spatters

The following are some of the causes of weld spatters.

1.) Current is excessive
2.) The electrode is damp
3.) Contamination
4.) Arc blow

Two Types of Testing

1.) Destructive Testing
2.) Non-destructive Testing

DESTRUCIVE TESTING
As the word implies, specimens tested by destructive testing, the specimens are destroyed during the test and are worthless after the test. Example of destructive testing are; bent test, tensile test etc

NON-DESTRUCTIVE TESTING
The quality of specimens are tested without destruction. Example of non-destructive testing are; radiographic testing, magnetic particle testing, penetrant testing, ultrasonic testing and eddy current testing

Each method of NDT (Non-destructive Testing) has its own advantages and disadvantages. Choosing the method to be used depends on the data of items to be tested.

Blogger UT-Man is an expert in UT and other NDT methods.

Welding Inspector's Course Schedule

I will be conducting Welding Inspector's Course on June 16-20, 2008 @ Sn. Vicente, Tarlac City.

If you are interested in attending this course, please feel free to contact me or post in this site.

This course is intended for graduate engineers, engineering students, graduate of any 4 year degree who wants to pursue their career in Welding Inspection and QA/QC.

The course content are; Duties and responsibilities of a welding inspector; welding processes; weld defects; types of steel; weldability; heat treatment; visual inspection; testing parent metals and welds; destructive tests; NDT techniques; welder and procedure approval; codes and standards; safe working practices

The course Fee is P5,000.00 inclusive of snacks, lunch and training material.

Causes of Lack of Fusion

1.) Joint preparation is too narrow
2.) Insuficient cleaning of weld joint
3.) Oily weld joints
4.) Poor welding technique
5.) Magnetic Arc Blow
6.) Wrong welding parameter settings

What is Welding Discontinuity and Welding Defects?

Discontinuity - an objective lack of material, an interruption in the physical consistence of a part.

Defect - an excessive conditions, outside the acceptance limits, which risks to compromise the stability or the functionality of the welded structure