Welding Defects and Visual Inspection

 Discrepancies, Defects, and Visual Inspection

 

Welding Visual inspection tools

Welding Defects and Visual Inspection: Knowing the manufacture and use of welds help The welder answers these questions. In general, the welder's The goal should be to avoid all defects; they all contribute

Welding students often ask questions such as:

• Which defect contributes to joint failure?
• Which inspections can pass?
• Are there jobs on which weld defects are allowed?

Portable handheld scanner for weld inspection

Weld and joint failure. marginal allowances may be allowed If the work is not essential. little tolerance is allowed in critical or code work because high power is required Due to load conditions of heat, pressure, or stress.

The severity of a discontinuity is one way of assessing the importance of classifying it as a defect. Real

Repairing an imbalance can cause more problems and increase residual stress if the defect is left alone. is

discontinuity linear (cracked) or nonlinear (spherical)

porosity, or tungsten inclusions)? is the end position fast

(like a crack), or does it have a radius (undercut)? what

The discontinuity breaks the surface or is it the subsurface? higher

The stresses will be localized at the counterbalance of the surface openings. Is discontinuity longitudinal to the load or transverse to the load? loading fatigue or bearing or

Just a static load? what is the ambient temperature

weld? Engineers will take up all these issues

Considerations when determining the design of a weld, materials, welding procedures, acceptance criteria, and what code or specification to adhere to.

If the welder expects to be recognized as a professional,

He will always try to do good work

to create a good appearance. inability to do so with high quality

Equipment available indicates negligence on the part of

Welder. This would certainly reduce the relationship that the store

Supervisors and other employees have for welders.

because the welder is looking at every inch of the weld as

Being built, he is in the best position to conduct a visual inspection. Visual inspection needs to be done first

Measuring fillet weld

Welding with proper joint fitting and material selection. This should be done after tacking during welding, root

Pass, Phil Pass, and Cap Pass. visual inspection required

welding is completed to determine weld

dimensions, overall part dimensional accuracy, and whenever post-weld heat treatment is required. American

The Welding Society has a certification program that recognizes people who have work experience and who have

Passed a multi-part test covering welding fundamentals,

Code interpretation, and practical inspection techniques.

Maximum 2 hours in each part of this three-part test

time limit. However, weld quality cannot be "inspected".

in." It must be made. Weld quality is made by each

A person associated with the project. as a professional

Welders, you must be properly trained for the job you are doing

Work. If this is code work, you will need to take a certification exam to demonstrate the required welding skills. Some

Companies will conduct knowledge tests which may include

Your ability to recognize weld discontinuities or defects.

Welding should be available with a professional welder

The process of demonstrating code requires welders

educated about its use. Since the welder will be required

determine whether acceptance criteria have been met, that or

He will need tools to measure weld size and joints.

Geometry.  some equipment usable for welding inspection. A kit like pictures 4-50. shown in

Available from sources such as the American Welding

Society. That's probably all for a welder doing fillet welds

Required suitable fillet weld gauge. 

The fillet shows the proper use of the indicator.

Palma in Handheld Scanner Technology . is included

The organizer does not have visual inspection methods and equipment

However, there is a

The dramatic change in equipment that is now

Available to assist the person inspecting the weld. generally

Speaking, these devices are known as handheld weld scanners. by aiming the scanner only at a combined preparation or

finished weld and activating it, the operator quickly achieves

Validates a multitude of measurements and their geometry against preset thresholds.

The handheld scanner then supplies the data via visual displays, computer-saved records, and strip chart printouts.

Typical features that can be measured at the finished joint include