Hardness Testing:
Hardness is the resistance of a material to localized deformation. The term can apply to deformation from indentation, scratching, cutting or bending. In metals, ceramics and most polymers, the deformation considered is plastic deformation of the surface.
For elastomers and some polymers, hardness is…
Welding of Stainless Steels:
General Concepts:
Stainless steels, resumed here in a general way, are defined as steel alloys, where the chromium content ranges from 10.5% to 30%. There are five distinct types of stainless steel:
Here are some rarely used NDT – Few Other Methods
1. Eddy Current Testing – ET:
Eddy-current inspection uses electromagnetic induction to detect flaws in conductive materials. A circular coil carrying current is placed in proximity to the test specimen (electrically conductive). The alternating current in…
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…
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…
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…
Fillet Weld Positions
The advantage of the fillet-welded joint is that it’s unnecessary to prepare the edges of the plates or sheets for welding. Double fillet-welded joints are an improvement over single-fillet joints because they can withstand loads from more than one direction.
Three of the…
Standards for Welding Positions:
It is very important for the Weld Inspector to know the position, or location of a joint relative to the horizon, because it may determine what welding process, methods, and techniques can be used.
Welding is usually easiest when the welder can…
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…
Types of Welding
Welding process involves joining of two metals and sometimes non-metals such as plastic
There are many different types of weld, as below:
Arc welding
Atomic Hydrogen Welding ( AHW)
Bare Metal Arc Welding (BMAW)
Carbon Arc Welding (CAW)
CAW-G—– Gas
CAW-S—-Shielded
CAW-T—–Twin
Electro Gas Welding (EGW)
…