Anything in the world can’t remain unchecked, especially the things that can pose a greater danger in the days to come. Just like any other inspection, there is also a welding inspection that has various procedures and checks carried out, like quality control.
These checks are done by none other than the Welding Inspector who does the Certified Welding Inspection himself/herself. During the inspection, the inspector utilizes various techniques to inspect welding, like the joints, the defects, thickness, materials, and even the location itself.
In this article, we are going to discuss the Certified Welding Inspection, what truly is this, who does this, and what is done during this inspection.
What actually is Certified Welding Inspection
Certified Welding Inspection is done to ensure that the quality and standards of welding meet the minimum requirements. Mainly, it is done to check whether there is a discontinuity at the place of welding or not and also to check the size of the weld.
You might already have guessed that all of these things are directly related to the strength of the weld and also the performance. If a loose weld is passed on and it is being used somewhere in a building or dangerous location, it can be extremely deadly later on.
The certified Welding Inspectors have been responsible for checking these defects in the weld to ensure it passes the minimum welding standards. Each welding project has a specific purpose, and there are standards made for specific projects to ensure they are usable.
Factors are taken into consideration at the Certified Welding Inspection
There are various factors that the Welding Inspector looks after at the time of Certified Welding Inspection. Some of them are;
- The acceptance criteria
- Required quality level
- Joint weld procedure
- Parameters of procedure
- Qualification of a welder in terms of the procedure approved
- Is CE marking or ped compliance necessary
- Consumables certification and control
- Amp’s and polarity
- Cooling control and pre-heat requirements
The Welding Inspector, who is specifically trained for this task, is responsible for performing the Certified Welding Inspection. They have a comprehensive understanding of various fields, such as symbols, procedures, drawings, requirements, weld joint design, testing, and inspection techniques.
It is important for inspectors to have high qualifications in order to properly inspect. There are various courses and programs available for welding inspection training, with the CWI program being the most popular and US-certified.
A Welding Inspector knows what they are doing during inspections and uses various tools to ensure welding quality and safety meet standards.
Welding Inspectors ensure welding quality and safety standards. They have significant responsibilities but also enjoy great rewards.
Duties of Welding Inspector
It is the sole duty of an inspector to check whether the actions and welding are according to specification or procedure or not. In the fieldwork, the inspectors usually look at these things, but they have to make reports in the office.
An inspector might be a senior welder who grew up to become an inspector, or an inspector can also be certified through training and so on.
The essentials of a Welding Inspector are;
- From quality to production of weld, observing all the actions relevant to it
- Recording all the points associated with the quality of the weld, giving a report that points out the flaws
- Comparing the recording to the minimum criteria pointed out for acceptance.
Furthermore, the inspector is also responsible for the pre-welding, during-welding, and post-welding work as well
- Document familiarization
- Visual acceptance application code
- Drawing the details of items and their tolerances or positions and so on.
- Procedure associated with quality control like handling, storage, control of documentation, and consumable issues with welding
- A checklist of an inspection, like a quality plan and a test plan deals with the inspection procedure, inspection, and records.
- Weather condition suitability
- Welding process compliance
- Correct welding technique used
- Suitable welding consumables
- Selecting appropriate parameters for welding
- Dressing for inter-run being carried out
- Weld identification
- Visual inspection
- Survey for dimensions
- Load and pressure test
Certified Welding Inspection methods
When doing the Certified Welding Inspection, the inspector utilizes various methods like;
For any application, the visual inspection is termed as budget-friendly and easiest. It is done visually, meaning the inspector doesn’t have to use complex tools and measurements to look at the weld.
In this Certified Welding Inspection method, the inspector will look at the flaws on the surface, cracks, warping, craters left unfilled, weld defects, and so on. It is done to identify the weld fitting issues and also the issues related to alignment, dimensions, and finishing.
The inspector can utilize some equipment in this lie;
- Straight edge
- Gauge to check fillet weld leg concavity, length, reinforcement, and convexity.
- The square has a pocket ruler to check the size.
- Magnification glass to examine the welding visually and precisely
Still, it doesn’t mean a good-looking weld is termed as the best, rather discontinuities and quality issues can be hidden deep inside the weld, which is not visible to the naked eye. Therefore, the inspector moves on to the next methods
The inspector can’t break the weld to look for cracks and discontinuities inside, rather there would be some method that looks at it without breaking the weld. Two of the most famous methods are ultrasonic weld inspection and radiographic weld inspection.
Using these, the inspector doing Certified Welding Inspection looks for the integrity of the weld, without even destroying the bonded materials. So, these are the two most common non-destructive methods used for testing.
The inspector uses radiographic inspection to go beyond the visual inspection and spotting cracks. Being a non-destruction inspection method, the inspector utilizes equipment that generates x-rays of a higher power.
These X-rays then pass through or penetrate the welded area, showing defects and damage that aren’t found visually. The only issue with this method is that it involves using hazardous equipment. So, under specific circumstances, the inspector can use it in Certified Welding Inspection.
Ultrasonic weld inspection
This is thus the greatest method utilized for looking into the internal and the external flaws together. Using the ultrasonic weld inspection method, the inspector can effortlessly look at discontinuations, measure issues, and so on. Same as radiographic inspection, the inspector can use them under certain conditions.
Surface crack detection method
This method involved the checking of cracks, porosity, discontinuities that can cause the surface to break, and seams. This detection is done by magnetic particle or liquid penetration inspection.
Liquid penetration test
To check the cracks on the welded surface, the inspector uses a liquid penetration test, as it is the best method for this use in Certified Welding Inspection. You can utilize the liquid penetration test for antiferromagnetic and ferromagnetic materials alike.
Using this Certified Welding Inspection method, the inspector can effortlessly spot even the smallest of cracks that anyone can’t see with the naked eye
Magnetic particle inspection
The inspector has complete control over this inspection, as he/she can easily adjust the testing levels. Using the magnetic particle inspection, the inspector looks for the flaws and finds them immediately. The only issue with this method is that it can be used only on a few materials like cobalt, alloys (some of them), nickel, iron, and other ferromagnetic materials.
Welding might seem like a relatively simple task until you have to consider what can go wrong if two metals are not joined well together. For the purpose of making sure that every weld is according to standards and meets the minimum requirements, there is a Certified Welding Inspection done by the Welding Inspector.
There are various factors and techniques associated with Inspection, therefore we compiled this article to help you understand what is done in Certified Welding Inspection.
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