• How to Solve Issues with Welding Over Paint There are a couple of welding problems that require some explanation and solutions. These are welding over paint and painting of welds. Welding over paint is discouraged. In every code or specification, it is specifically stated that welding should be done on clean metal. In some industries, however welds are made... Read more >>
  • Oxy-Acetylene Welding of Cast Iron Oxy-Acetylene Welding of Cast Iron Oxy-acetylene welding of cast iron is comparatively easy, if attention is paid to some simple rules. The cast iron in common use is known as “gray;” it is quite soft, easily machined and has a lower melting point than wrought iron or steel. It contains... Read more >>
  • TIG Welding Process TIG Welding Process, Torch Angle, Tungsten Grinding and Stainless Steel. Things to keep in mind when TIG Welding Position TIG torch about an 1/8 of an inch from the surface. TIG Torch angle Once an arc is established, angle the torch about 15 to 20 degrees away from the direction... Read more >>
  • Surface Cleaning Surface Cleaning It is most important to properly prepare the surface to be welded because a satisfactory weld cannot be made over thick paint, rust or marine growth. The initiation of an arc may be impossible or, at best, very difficult when the surface has not been made ready for... Read more >>
  • Welding Stresses and Cracking In this section,* welding stresses and their effect on weld cracking* is explained. Factors related to weldment failure include weld stresses, cracking, weld distortion, lamellar tearing, brittle fracture, fatigue cracking, weld design, and weld defects. When weld metal is added to the metal being welded, it is essentially cast metal.... Read more >>
  • Welding Arc Blow : How to Minimize Magnetic Forces  Welding arc blow is the deflection of an electric arc from its normal path due to magnetic forces. It is mainly encountered with dc welding of magnetic materials, such as steel, iron, and nickel, but can also be encountered when welding nonmagnetic materials. It will usually adversely affect appearance of the... Read more >>
  • Weld Failure Analysis  Weld Failure Analysis. Only rarely are there failures of welded structures, but failures of large engineered structures do occur occasionally. Catastrophic failures of major structures are usually reported whenever they occur. The results of investigations of these failures are usually reported and these reports often provide information that is helpful... Read more >>
  • In Service Cracking In Service cracking, due to stress corrosion, hydrogen embrittlement and corrosion fatigue are typical of material/environment interactions that are not fully accounted for in the ASME (American Society of Mechanical Engineers) Code design rules. In welding, the HAZ (Heat Affected Zone) contains a potentially crack susceptible metallurgical structure, hardness variations and residual... Read more >>