|Statement||by S. F. Rennie and G. B. Holloway.|
|Contributions||Holloway, G. B.|
through the use of precision SAW welding techniques for thin steel panels. High-speed tandem narrow groove (NG) submerged arc welding (SAW) procedures were developed with improved flux copper backing (FCB) using advanced power supplies and controlled weld joint root gap openings. METALURGIJA 41 () 2, 85 J. TUŠEK: NARROW-GAP SUBMERGED-ARC WELDING WITH A MULTIPLE-WIRE ELECTRODE Submerged-arc welding is a high-productivity process for joining materials with high energy and filler-material efficiencies. In practice a number of submerged-arc welding units are known. This is a well known procedure also for narrow gapCited by: 4. Application of High Speed Rotating Arc Narrow Gap Welding Method Photo 1 shows the main applications of the high speed rotating arc narrow gap welding method and an example of the cross-sectional bead shape. The main objects of application by JFE Engineering are (a) heavy equipment parts, such as piston cylinders and (b) bridge. Again, all other parameters being the same, larger-diameter electrodes or higher WFS will increase volume per pass and decrease the overall number of passes. For example, a 3/8-in. welder qualification plate test completed in the 1G (flat) position might be done in as few as two passes or in as many as seven passes or more.
mately 30 mm at the surface of the groove, final pass welding was performed by one layer and one pass one-layer SAW welding. In performing full thickness welding of heavy thick plates by narrow gap welding with a high speed rotat-ing arc, there are problems related to the progress of the shop line, maintaining the width of the groove, etc. This welding procedure uses joint preparations with small, included angles, typically in the range °, which require less weld metal and less welding time to fill. Narrow gap techniques have been applied when welding using submerged arc welding (SAW), gas shielded metal arc welding (MIG/MAG, GMAW) and tungsten inert gas welding (TIG, GTAW. RE: Multi-pass submerged-arc welding Welder1 (Materials) 31 Mar 03 With narrow gap SAW the angle between one weld face and another on the deposited weld is critical. In my understanding, welds up to 1/4" are possible as single pass welds (but as mentioned above it depends on the type of rod used e.t.c.). Larger welds would be proportionate to the weld volume which is proportionate to the leg length squared. so by this theory 3/8" is two/three pass, 1/2" is a 4 pass .
In Duplex Stainless Steels, Submerged arc welding. Submerged arc welding (SAW) is an attractive process for larger pipes, vessels and heavier wall thickness components in general. Practical experience is generally good, although nitrogen-induced porosity and transverse and longitudinal cracks have been observed. 7 These cracks are not always easy to observe on X-ray . Submerged Arc Welding: A discussion of the welding process and – Multi-pass, unlimited thickness, high toughness • Active – High in deoxidizers, high speed, weld over rust, • Two-layer deposit • Thickness –1/8”per layer, 1/4” total • Chemistry –Fe-5 or Fe at 1/8” above original surface 6 SUBMERGED ARC WELDING E P D O S I T I O N R A T E S Single Wire Tiny Twin Arc Long Stick Out Standard platform Easy to upgrade Deposition rate up to 10 kg/h 1 – Power source 1 – Wire feeder 1 – Wire Very low additional investment High deposition rate Low heat input (less distortion) Flux / wire ratio reduction Deposition rate up to 30 kg/h. Note that figure 2 (above) as well as figures 3, 5, 6 and 7 will show cross sections (and the resulting penetrations levels) of welds made with the Submerged Arc Welding (SAW) process. The SAW process was chosen to illustrate the effect (or none effect) that these various welding variables have on penetration level because the results are more.