Nondestructive Testing service providers

  Non destructive Testing (NDT)- Common Methods are: Visual Inspection – VT Liquid Penetrant Testing – LT Magnetic Particle Testing – MT Radiographic Testing – RT Ultrasonic Testing – UT 1.   Visual Inspection – VT: Visual inspection after welding is very useful in evaluating quality, even if other testing methods are to be employed. As welding progresses, surface flaws such as cracks, porosity, and unfilled craters can be detected only by Visual Inspections, leading to repairs or rejection of the work. Welds must be cleaned from slag to make inspection for surface flaws possible. A  10x magnifying glass  is helpful in detecting fine cracks and other faults. As indicated before, a  borescope and dental mirrors , are useful for inspection inside vessels, pipe, or confined areas. Visual inspection  is the most popular and the most widely used of the non-destructive inspection techniques. Completed welds should be checked according to the plans and the sp...

  We would see about Recommendations for Welding of Structural Steel as per AWS D1.1 , 2020 revision Groove Weld: (Clause 4.4.1) Weld Length : shall be the width of the parts joined , perpendicular to the direction of compressive or tensile stress, Weld Size:  Thickness of thinner part of two joining sections, (with no excess re-enforcement achieved with a improper weld bead) Partial Penetration Weld : Weld Thickness: (Clause: 4.4.1.3) The size of Partial Penetration Groove welds shall be selected from the below  table 5.5  based on the thickness ‘ T’ of the joining base metal , Consider the thickness of the thicker part if two different thickness is joined. Fillet Weld Size. Minimum size of Fillet: (Clause :4.4.2.8) The minimum Throat thickness of fillet weld shall be selected from table below Size of Fillet Weld in Lap Joints: For Base Metal Thickness < 6mm , the fillet Leg size = thickness of base metal For Base Metal Thickness  >  6mm, the Fillet ...

  The sole purpose of welding procedures is to describe the details that are to be followed in the welding of specific materials or type of joint. The following is a   list of standard specifications for welding procedures  that are normally covered in welding procedures specification for all welding processes. Nondestructive Examination – ASME Section V A. Article 1, General Requirements: The Welding Inspector should be familiar with, and understand The Scope of Section V Rules for use of Section V Responsibilities of the Owner / User and Subcontractors Calibration, Inspection and Examination Record Keeping Requirements B. Article 2, Radiographic Examination: The Scope of Article 2 and General Requirements, The Rules for Radiography applied on butt welded seams: Required Marking; Type, Selection, Number, and Placement of IQI’s; Allowable Density and Density Ranges; Control of Backscatter Radiation; 3. Recording of inspection; C. Article 6, Liquid Penetrant Examination (I...

  Positions for Welding Pipe For welding pipe in shops, power plants, oil refineries, and chemical plants for crude oil, gasoline, and natural gas, the same basic welding positions described previously are used. Flat Butt Weld Pipe Position – 1G A pipe to be welded in the flat position  is usually placed on roller dollies or wooden skids . As the pipe is welded, it’s rotated on the dollies or skids. This procedure  is the same as the flat position plate welding . The speed of rotation should be the same as the welder’s forward welding speed. Horizontal Butt Weld Pipe Position – 2G In this position, the weld around the vertical pipe  is the same of a horizontal position plate welding.  There is little difference whether the pipe is rotated or fixed because the welding is the same. Either the welder will circle around the joint, or the pipe itself can be turned in a circle if it’s free to rotate. Multiple Butt Weld Pipe Position – 5G In this position, the axis of ...