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 […]

Non-Value Added Activities Affecting Welding Costs

Many fabricators struggle to get a grip on their welding costs.  The best they can do is try to find suppliers that will sell them their consumables, gas and other raw materials at a lower price.  Those who try to reduce costs by being more efficient soon realize that simply speeding up welding is not […]

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 […]

Who Can Qualify My Welders?

There is a misconception in our industry that the qualification of welders, and welding procedures for that matter, needs to be done by a certified welding inspector (CWI) or a welding engineer.  Or that it has to be done by a third party.  Although this may be the case if specified in contract documents, more […]

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 […]

Common Tests for Welder Performance Qualification

The purpose of welder performance qualifications is to ensure that the welder can deposit sound welds.  There are several tests, both destructive and nondestructive, that are used to evaluate a welder’s ability to deposit good welds.  Below are four of the most common test applied for these qualifications:   Visual Inspection (VT) Visual inspection is […]

What is Stress Relieving and Why We Need It

Stress relieving is a form of post weld heat treatment. In stress relieving we heat a material to a specific temperature; hold it at this temperature for a specified amount of time in order to reduce or eliminate residual stresses; and then cool it at a slow enough rate to prevent these stresses from redeveloping. […]

Is Weld Strength Affected by Shielding Gas Mix?

Can our selection of shielding gas affect the strength of a weld and other important mechanical properties?  Absolutely!  The difference is more pronounced when using flux-cored (FCAW) wires than when using mig (GMAW) wires, especially as the wire’s tensile strength goes up.   Although we can affect strength by using different gases, what we should be […]

Pick Your Prequalified Welding Procedures Carefully

If you work with AWS D1.1 you are probably familiar with the use of prequalified welding procedures.  The use of prequalified WPSs provides many benefits to the fabricator, one of which is costs savings due being exempt from having to perform costly testing to qualify the welding procedure.  However, if you are looking to save […]