Preventing Hydrogen Induced Cracking

Our last post (Factors Influencing Hydrogen Induced Cracking) went over the factors that contribute to hydrogen-induced cracking.  We will now go over how to prevent HIC from happening.  If you recall, we mentioned you need all three factors to be present in order to have HIC:  These factors are 1. a susceptible microstructure, 2. threshold […]

Factors Influencing Hydrogen Induced Cracking

Hydrogen-induced cracking (HIC) is a far too common type of failure. It is also called hydrogen assisted cracking (HAC) and delayed cracking since it does not occur right after welding, but a few hours or days after the weld has completely cooled down to ambient temperature.  Cracking occurs due to a significant loss in ductility […]

Understanding Weld Discontinuities

Not all discontinuities are defects

Not all weld discontinuities are weld defects, but all weld defects are discontinuities. Understanding the difference will let you know if you need to scrap a part, repair it or simply add more weld. There are many codes depending on what type of product you are welding on. The codes are used as guidelines by […]

Importance of Root Fusion

Depth of Penetration Affects Weld Strength When welds are sized from a design standpoint, the theoretical throat is used to calculate weld strength.  This means that the desired strength of a weld is achieved by attaining fusion at the root and side walls. Before going on we’ll define fusion and penetration as these terms are not […]

Why Welds Crack

A weld failure is never good.  Whether  a weld cracks on a truck’s axle or on the post holding your house’s fence, there are always consequences.  Hopefully the consequences are limited to time and money.  Unfortunately, weld failures can cause injury.   Welds can fail due to design flaws, but the majority of weld failures occur […]

Hot Cracking vs Cold Cracking

We recently helped out a customer in determining why some of their welds were cracking.  It was determined that cracking on their parts was due to rapid cooling and improperly sized welds. The discussions we had before and after determining the cause were quite interesting.  We went over the typical causes for cracking with our […]