May 15, 2023 · Lack of fusion (also called LOF or incomplete fusion) occurs at weld metal (WM) or weld interface (WI) when the weld metal fails to fuse completely with the base metal or with …

Jul 19, 2017 · undercut is a defect caused by melting: high current. The bevel in the root zone is melded, but the excess of current , after melting the bevel, 'impact' the base metal adjacent to …

Jul 9, 2009 · Historically, RT has had a tighter criteria for lack of fusion and cracks because it's POD (probability of detection) is a) not as efficient as UT for planar type flaws and b) because …

Jun 20, 2022 · There are several ways to check for lack of fusion in welding. Radiographic testing (RT) and ultrasonic testing (UT) are two common Non- Destructive Testing methods that can …

Mar 27, 2022 · A and B seems more like Slag and C because of its sharp ending edge may more relevant to LOF. For 2nd radiograph it seems like LOF due to unfused adjacent weld passes …

Apr 3, 2003 · It is fairly common to use RT for volumetric examination of fillets, but if shot from the wrong direction, the film may show an indication that is actually a normal root. Most …

Aug 18, 2008 · You can do RT, but its not required by code - if I recall correct. However, you can get some really goos shots, clearly showing LOF, LOP and the preperation prior to welding. …

Jan 13, 2025 · Lack of fusion (LOF) defects occur when the weld metal does not fuse properly to the parent metal leaving an area within the weld with a very thin gap. This reduces the …

Jul 3, 2015 · ASME 31.3 Butt Weld Radiographic Interp on LoF and IP. ASME 31.3 states on table 341.3.2 in regards to acceptance criteria for Girth, Groove and brance connection welds, Lack …

Jan 31, 2012 · If the RT firm is wrong, either fire them and hope for better techs from the next one, OR pay for UT - shearwave ultrasound - of any purported LF 'called' by an RT tech. If UT …