Should You Consider a Different Shielding Gas

GMAW (mig welding) uses shielding gas to protect the weld puddle from the atmosphere while in a molten state.  This is general knowledge, but many in our industry believe this is the only function of the shielding gas.  Shielding gases can affect welding in many different ways and an evaluation of your current choice of […]

Common Mistakes That Lead to Hydrogen Induced Cracking

Even when a qualified welding procedure is in place

Hydrogen Induced Cracking (HIC), also called hydrogen assisted cracking (HAC) and cold cracking, is a common welding defect when welding heavy steel sections and steels with high carbon content.  If you would like to learn more about the causes of HIC read Factors Influencing Hydrogen Induced Cracking. In the above mentioned article we explained that […]

Understanding Certificates of Conformance for Filler Metals

Most of the time when we ask a manufacturer of welding consumables for a certificate of conformance it is simply to have it on file.  But sometime we need to actually read and understand it to make sure that filler metal meets the mechanical and physical requirements of our specific application.  Certificates of conformance contain […]

How to Determine the Shear Strength of a Fillet Weld

In our previous post we explained how to determine the strength of a transverse fillet weld.  A transverse fillet weld is one that is perpendicular to an applied load.  We will now look at how to determine the strength of a fillet weld under shear stress. If the load applied is not perfectly perpendicular to […]

How to Determine the Strength of a Transverse Fillet Weld

Unless you are a design engineer you typically don’t have to worry about determining the strength of a weld.  The strength of a weld refers to its load carrying capacity, or how much load it can handle before it fails.   However, it is very important for all of us involved in the welding process, from […]

How to Qualify Welders for Internal Purposes

Whenever we think about qualifying welders we typically think about welding codes such as one of the AWS structural welding codes, API 1104 or ASME Section IX.  In most cases qualifications are carried out to comply with a customer requirement. But what if you simply want to qualify your welders as part of your own […]

How Hard is the CWI Exam?

Why passing rate is so low and what to do about it

Are you planning on becoming a certified welding inspector (CWI) in the near future?  Or do you need one of your employees to get this certification?  If so, you have probably heard that the exam is pretty tough.  Although the American Welding Society (AWS) does not publish information on passing rates, it is estimated that […]

Causes of Porosity in Submerged Arc Welds

Submerged arc welding is typically done automatically, meaning it is not done by hand but rather it is set up as hard automation.  The operator simply controls the welding machine and torch position to obtain the desired results.  Typically the system is run by an operator and not a welder.  So when problems arise the […]