Understanding Why Your Welds Crack – Part 2

Direction of Cracks

In our previous post we discussed categorizing cracks based on when they occur.  If you missed this you can read it at Understanding Why Welds Crack: Timing. As discussed in this previous article, cracks can and should be categorized based on three criteria: Timing – did the crack occur immediately after welding (hot crack), did […]

Understanding Why Your Welds Crack – Part I

Timing of Cracks

Cracks are perhaps the only discontinuity for which there is no allowance.  Most codes require that cracks be repaired.  Crosscheck cracks on some hardfacing applications may be OK, but in general, if a weld cracks it’s a big problem. This problem is time consuming and costly in most cases. When you get a crack you don’t […]

How to Avoid Sensitization When Welding Austenitic Stainless Steels

Stainless steels are iron based alloys that contain a minimum of 10.5% chromium.  This chromium reacts with the air and forms a very thin but very tenacious chromium oxide layer which is what prevents stainless from rusting. There are 5 types of stainless steels which are categorized depending on additional alloying elements.  One thing they […]

Why is Preheating Necessary?

Preheating steel before welding is common practice. Sometimes we apply heat after we are done welding as well. Other times we apply heat between passes to maintain the minimum interpass temperature.  Many use preheat simply because it is written in the WPS, but not really understand why it is necessary.   Preheating is used for […]

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 […]