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Concrete Testing & Special Inspections

If you are an owner, contractor, or engineer associated with the design and construction of structures, you want to verify that the materials used during construction comply with the project specifications. To ensure today’s buildings and infrastructure perform adequately during long time periods, proper selection, quality and workmanship of materials is vital. You need a trusted and reliable partner for construction materials inspections with state-of-the-art construction materials testing laboratories. CTI  construction material testing engineers work with clients to minimize material replacements, reduce the likelihood of deterioration, avoid potential failures, and investigate and evaluate materials-related problems and failures when they do occur.​

Local knowledge and resources, combined with the technical support available from our network of Inspectors, & engineers enable CTI to respond quickly to ever-changing construction needs and schedules.


A welder performance qualification (WPQ) is a document that shows that a particular individual is qualified to weld in accordance with a specific variables in accordance with the code in question.

This is accomplished by individuals successfully passing a weld test usually in accordance with or following the parameters of a qualified or prequalified welding.

​If the welder has satisfactorily completed the procedure test then he is automatically approved but each additional welder must be approved by completing an approval test to an appropriate standard such as AWS, ASME, Mil-spec, and AISC 

Complete a weld test as stated above. The test should simulate production conditions and the welding position should be the position that the production welds are to be made in or one more severe.​

Test the completed weld in accordance with the relevant standard to ensure that the weld is clean and fully fused.

Once the test is completed the necessary certification documentation will be generated by the WCIS personnel.

Note that any changes that require a new welding procedure (WPS) may also apply to the welders approval, refer to the referencing code/ standard for precise details

* Shielded Metal Arc Welding (SMAW)

With this particular type of welding, the welder follows a manual process of stick welding. The stick uses an electric current to form an electric arc between the stick and the metals to be joined. This type is often used in the construction of steel structures and in industrial fabrication to weld iron and steel.

* Gas Metal Arc Welding (GMAW/MIG)

This style of welding is also referred to as Metal Inert Gas (MIG). It uses a shielding gas along the wire electrode, which heats up the two metals to be joined. This method requires a constant voltage and direct-current power source, and is the most common industrial welding process. It has four primary methods of metal transfer: globular, short-circuiting, spray and pulsed-spray.

* Flux Cored Arc Welding (FCAW)

​This was developed as an alternative to shield welding. The semi-automatic arc weld is often used in construction projects, thanks to its high welding speed and portability.

* Gas Tungsten Arc Gas Welding (GTAW/TIG)

​Welding together thick sections of stainless steel or non-ferrous metals is the most common use for this method. It is also an arc-welding process that uses a tungsten electrode to produce the weld. This process is much more time consuming than the other three and much more complex, too.



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