What is the difference between globular and short-circuit transfer? Short-circuit is a mode of metal transfer in GMAW in which metal is transferred from the electrode to the weld pool via a series of electrical shorts. When the electrode (wire) touches the base material a short occurs and the arc goes out. At this point […]
In our many years of working in the welding industry we have come across some phenomenal welders. We continue to be impressed by the level of skill of many of these men and women. Unfortunately, many business owners and managers allow this skilled labor to go underutilized. Welder efficiency, which also goes by other names […]
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 […]
The qualification of welders and welding procedures often involves macro-examination of welds. Performing macro-etches is a relatively simple procedure, but strict guidelines must be followed to ensure safety. Most chemicals used in etching solutions are hazardous and must be handled accordingly. Any person etching with these chemicals must familiarize him or herself with the corresponding […]
Our previous article discussed the importance of having a specification for weld quality. In this article we’re talking about the importance of one of its basic components: Welding Procedure Specifications (WPSs). Many fabricators don’t have WPSs. They rely in the experience of their welders to select the right parameters. As much as we want every […]
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 […]
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. […]
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 […]
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 […]
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 […]
