4 Key Factors Affecting the Fatigue Life of Welded Structures

Designing for fatigue is very different than designing for static loads.  One of the biggest challenges is being able to estimate the loads, timing of the loads and duration of the loads.   If you look at a bridge you have to estimate the number of vehicles going on the bridge every day, the weight of […]

Estimating the Fatigue Life of Steel Welded Structures and Components

Using S-N curves and formulas from Clause 2 of AWS D1.1

Heat affected zone crack induced by hydrogen. The crack originates at point of high stress as hydrogen diffuses out of the weld and heat affected zone.

The majority of industrial equipment and welded structural components are subjected to repeated fluctuating loads. These loads are typically of magnitudes that are within the elastic region of the material and well below its yield strength. This means that any deformation of the structure caused by the applied stress will then return to its normal […]

Weldability of Annealed, Normalized, Quenched and Tempered Steels

We frequently receive requests for help developing welding procedures for welding on quenched and/or quenched and tempered steels.  Sometimes the call for help is to determine why these steels cracked after welding and how to prevent it from happening in the future. Understanding the supplied condition of the steel you are going to be welding […]

How Carbon Content Affects the Weldability of Steels

And its effects on strength, hardness, ductility and machinability

Steel is an alloy of iron and carbon along with several other elements in small quantities, all of which have an impact on its properties. Steels can contain varying amounts of carbon and are typically categorized as low, medium or high carbon steels. Low carbon steels are those containing 0.30% carbon or less.  Medium carbon […]

Importance of Weld Failure Analysis

Basic guidelines to troubleshoot weld failures

When a weld fails we don’t always know what caused it.  We may try something different and if it doesn’t fail the next time we adopt that as the new standard.  However, it is very important to know the root cause of weld failures.  If we don’t know what caused the failure how can we […]

What is Post Weld Heat Treatment (PWHT)?

What is it? Why is PWHT needed? How is PWHT done?

Have you heard of post weld heat treatment (PWHT)? Of course you have. If you are involved in welding you have definitely heard this term.  But what is PHWT? When is PWHT required?  What temperature should PWHT be done at?  Heat treating of materials can be a very complicated subject, but when it comes to […]

The Importance of Weld Repair Procedures

A repair procedure is necessary any time there is a defect in welding that must be corrected.  The repair procedure is not just a welding procedure specification, but rather a set of instructions and rules on how to repair different types of defects.  There is no standard format for a repair procedure, or a standard […]

Weld Troubleshooting for Non Welding Engineers

NOW AVAILABLE! Troubleshoot common welding and welding equipment problems the way welding engineers do. For more information CLICK HERE or the image  below. Learn and follow the process used by welding engineers to find the root cause of welding problems and their solutions. This troubleshooting guide goes beyond your typical troubleshooting charts on the back […]

6 Ways to Eliminate Cracks in Steel Welding

Cracking is a big problem in welding.  Many of our customers experience cracking problems on an ongoing basis. Unfortunately, these cracks are not always detected in the shop.  Many times cracking occurs once the product is in service.  In these cases, cracking can lead to failure and at the very least an upset customer.  In […]

Why you should take Undercut very seriously

Can it lead to catastrophic failure?

Undercut is a surface discontinuity resulting from melting of the base metal at one or both toes of a weld which remains unfilled by the weld metal.  It can also occur at the root of groove welds.  Undercut presents two problems. First, it forms a mechanical notch which acts as a stress riser and is […]