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 ...

  Non Destructive Testing has plenty of scope for people interested in Mechanical Industry and also construction sector. This Quality Control Related subjects is thought in almost all major cities all over the world, and the NDT certificates offered by institutes are valuable across the globe. The techniques thought during the courses are applicable to almost any manufacturing &  construction sector, which gives the Trained/ certified persons job opportunities in vast areas. Job opportunities are in foundries, steel Plants, aluminum smelters, Oil & Gas extraction plants, refineries, Plant Construction, railways manufacturing, automobiles machine shops, transport equipments fabrication, earth movers manufacturing, civil structures and pre-fabricated structures. The course fees for NDT varies from 20,000 INR to 3 Lakhs approx or even more depending on the standard which we choose for up gradation. The below are the standards (with abbreviations / Full form)  in whic...

  Welding Procedures Follow a clear example of  test coupons welding procedures for a  3G welding certification . In this 3G  welding procedure the notes were taken from the  same section of the AWS code  that are used for the  3/8 inch  limited thickness test procedure. The  test coupons  shall be  pre-cut  and ready to prepare. The welder shall grind the face of the test plates a minimum of one inch back from the bevel and a minimum of a quarter of an inch. Next the backing bar to bare metal shall be cleaned with a grinder and cleaned the oxidation off of the bevel, to bare metal. After the Welding Inspector will check the bevel angles with a protractor. 1. The Root Pass: The welder shall set to  root opening with two 1/8 inch  welding electrodes and then the test plate shall be inspected for fit-up. The test coupon shall be put in a  vertical position  and marked with a  white marker  to make su...

  Failure investigation often   uncovers facts  that lead to changes in design, manufacturing, or operating practice, which will eliminate similar failures in the future. Failures of insignificant parts can also lead to advances in knowledge and should be done objectively, as with a large structure. The following four areas of interest should be investigated to determine the cause of weld failure or weld defects and the interplay of factors involved: Initial observation . The detailed study by visual inspection should be made at the failure site as quickly as Photographs should be taken, preferably in color, of all parts, structures, failure surfaces, fracture texture appearance, final location of component debris, and all other factors.   Background data . All information concerning specifications, drawings, component design, fabrication methods, welding procedures, weld schedules, repairs in and during manufacturing and in service, maintenance, and service use. Att...