5 Common Mistakes Made Welding Stainless Steel

Most types of stainless steels have good weldability and can be welded with all arc welding processes (GMAW, FCAW, GTAW, SMAW and SAW).   Stainless is used in many different applications for its strength, abrasion resistance and corrosion  resistance.  Unfortunately, many assume it can be welded just like carbon steel. In fact, this is the first […]

Importance of Implementing a Specification for Weld Quality

Understanding the basic components

If you have been reading our articles for some time you know how strongly we feel about having documented welding procedure specifications which have been qualified by testing or prequalified in conformance with code requirements. Yet when we recommend that these very important documents be developed and used in production we get a lot of […]

How to Weld Quenched and Tempered Steels

It is often incorrectly assumed that quenched and tempered (Q&T) steels are hard to weld or even completely unweldable.  This assumption is inaccurate as most Q&T steels have great weldability.  However, extreme care must be taken to prevent cracking or loss of certain mechanical properties.  A very common quenched and tempered steel is ASTM A514.  […]

7 Ways to Eliminate Porosity in Your Welds

Porosity is a weld discontinuity that is not as detrimental to structural integrity as cracks, undercut, overlap and lack of fusion. However, it is unsightly and when painted it becomes an eye sore. Because it does not have sharp ends, porosity does not propagate like a crack. The reason for limits to the amount of […]

Weld Toughness vs Weld Strength

If you have ever been tasked with selecting the right specification and grade of steel for a particular application you know there are hundreds of choices.  Typically these are based on the materials tensile strength and yield strength.  There are many factors that go into selecting the right base metal for a given application.  In […]

7 Variables That Affect Weld Penetration

Complete joint penetration (CJP) welds will have the exact same effective weld size regardless of welding process.

Getting deeper penetration, or at least adequate penetration is very important in welding.  There are a few applications in which we wish to minimize penetration, but in general we always want good penetration.  There are many variables that affect penetration, some more than others.  It is important to know how each individual variable affects the […]

Dangers of not Maintaining Proper Interpass Temperature

Last week we had the pleasure of working with a fabricator of pressure vessels in order to help them reduce manufacturing costs.   As mandated by the ASME Boiler and Pressure Vessel Code this fabricator had welding procedure specifications (WPSs) and procedure qualification records (PQRs) in place.  These were properly written, tested and documented. The WPS […]

5 Factors that Contribute to Silicon Island Formation in Welds

The formation of silicon islands on welds made with the GMAW (mig) and MCAW (metalcore) processes is very common.  For the most part, these silicon islands are not a problem.  However, if the weld is to be painted, you better remove these islands. Otherwise, they will eventually pop off and leave an unpainted spot in […]

How to Weld Weathering (CORTEN) Steel

Corten, or COR-TEN, is the trademark name for weathering steels manufactured by U.S. Steel Corporation.  Weathering steels are a family of low carbon steel alloys that were specifically developed to provide higher strength and more importantly eliminate the need to paint to protect against the elements (rain, snow, humidity, sun, salt, etc.). A242 and A588 […]

10 Types of Welding Discontinuities Explained

Not all discontinuities are defects

Cracks can lead to catastrophic failure in a relative short amount of time.

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 […]