Nondestructive Testing service providers

  Why use this TIG welding process: TIG Tungsten Inert Gas otherwise called as GTAW- Gas Tungsten Arc Welding , Involves melting the metal using the arc created by tungsten electrode, The welding can be done with or without filler metal, Argon Gas is used as shielding around the weld area, to shield the weld from atmospheric gases. As an inert gas is used for shielding the weld, the quality of weld is good without any Slag inclusions and good weld profile. TIG welding is selected to receive a high quality welds for analysis purposes   Where we use dissimilar metals ? Dissimilar metals are used in process pipe line industry, heat exchangers, boilers and Structural steel fabrication industry. SS 304/ SS316 (Austenitic Stainless Steel ) ASTM A -210  (Medium Carbon Steel) ASTM  A-36  (Low Carbon Steel )   Types of Weld Joint : Butt Joint, T Joint, Lap Joint , Corner Joint, Edge Joint Types of Joint Configuration: Joint Design:   Why we use Butt Joints To c...

Unless otherwise authorized by the engineer, any welding to the top flange of  steel members for supporting floor form joists and finishing machine rails  will not be permitted. Welding of hangers and supports to shear studs will be permitted as follows: The welder must be certified and use low hydrogen electrodes and proper No welding shall be permitted when the ambient temperature of the air is below 32° F (0°C) or when the lowest temperature during the preceding 12 hours has been below 0° F (-18°C). Windbreaks or shields shall be provided when the wind chill factor is strong or cold enough to prevent welding from being carried out in a normal manner without such Welding shall not be permitted on surfaces that are wet or exposed to Arc strikes on bridge flanges must be prevented at all times. 1. Welding of Railroad Bridge Deck Floors: Railroad bridges that  span highways  are designed with a  steel deck  that covers the bridge and are welded together in t...

  NDT Method Selection: The NDT (nondestructive testing) methods are:   Visual Inspection – VT Liquid Penetrant Testing – LT Magnetic Particle Testing – MT Radiographic Testing – RT Ultrasonic Testing – UT Eddy Current Testing – ET (not used in field inspection) Acoustic Emission Testing – AET (not used in field inspection) Phased Array Ultrasonics – PA Time Of Flight Diffraction  –  TOFD Since each NDT methods has its own set of advantages and disadvantages and some are better suited than others for a particular application, the NDT technician or engineer  must select the method  that will detect the defect or make the measurement with the  highest sensitivity and reliability . The cost effectiveness of the technique must also be taken into consideration. The following table provides some  guidance  in the selection of NDT methods for common flaw detection and measurement applications. AQC (Advanced Quality Centre) is an ISO 9001:2015 certif...

  Bend Test Coupon Preparation First the centerline on the plate shall be marked. Then another line  1.0 inch  above the center line  and another line 1 inch below the center line. This is the section that can be used as an  alternate coupon  in the event of  corner cracks  with no evidence of slag inclusions. Next, marking of the actual  root  and face bend specimens. Using the top and bottom line, another line a minimum of  1½ inches above.   The top line shall be marked and then  1½ inches below  the bottom line. The  minimum width  of a test specimen needs to be  1½ inches  wide. After that the  Welding Inspector shall mark the weld test coupons  for a root and face bend in agreement with the welder, cutting them on a band saw. Backing Bar Removal: The  backing bar  removal can be done using a vice and using a grinder on the center of the backing bar to gouge it, about ...