Buried-Arc Transfer The arc in carbon dioxide is very forceful. Because of this, the wire tip can be driven below the surface of the molten weld pool. With the shorter arcs, the drop size is small, and any spatter produced as the result of short circuits is trapped in the cavity produced by the arc—hence the name buried-arc transfer. The resultant welds tend to be more highly crowned than those produced with open arcs, but they are relatively free of spatter and offer a decided advantage of welding speed. These characteristics make the buried-arc process useful for high-speed mechanized welding of thin … Continue reading Buried arc transfer mode in welding

New updates on ASME IX – 2019: Using qualification test coupon qualified in 2G, or 1G-Rotated position can develop a WPS to weld with “All” positions in production. ***Flashback to the ASME IX – 2015 & older: The Supplementary essential variable QW-405.2 applies to the test weld coupon when the Notch toughness tests are required by the applicable Fabrication/ End using Codes (Ex: ASME B31.3). In this case, the QW-405.2 will supersede the Non-essential variable QW-405.3 (Changes of weld progression), QW-405.2 becomes an essential variable and requires that a change from any position to Vertical uphill progression requiring Re-qualification of … Continue reading ASME IX QW-405.2 Position variable

There are certainly many answers for what exactly does HOT PASS means in welding terminology and from where it actually evolved. Different people had a different opinion and they are as below mentioned. It is to fill the weld bevel. It is to melt and float out the wagon tracks left after the root pass. To release trapped gases, hydrogen entrapment at root weld to minimize the risk of Hydrogen induction cracking (HIC). A significant other is that a large majority of pipeline welds are done in a clamp and under some sort of stress. A root bead and hot … Continue reading Hot pass in Welding terms

A lot more depends on the selection of the electrode type for successfully carrying out weld with SMAW process. A wrong selection of electrode type may lead to more defects, more repairs. The selection of the correct type of electrode coating results in weld metal with desired quality characteristics at low cost. In general, the welding electrode is selected in such a way that characteristics of weld metal are similar to or better than the base material while keeping in mind the welding position and weld joints design as they significantly affect the properties of the weld. The covering of … Continue reading Electrode flux types and selection (Part 2)