www.engineeringnews.co.nz 17 ANGLE OF TRAVEL It is best to hold the electrode perpendicular to the joint being welded. This allows the user to tilt the top in the direction of travel about 5 to 15 degrees. For welding vertical up, use the forehand technique whereby the top of the electrode it tilted up to 15 degrees away from the direction of travel. MANIPULATION OF ELECTRODE Each welder should develop his or her own style by practicing and also looking at other peoples’ techniques. Any material thinner than 6mm means that weaving the electrode is unnecessary because the bead will be wider than needed. In many instances a straight bead is all that’s required. With thicker material, a welder can create a wider bead by moving the electrode side to side. This creates a continuous series of partially overlapping circles in a “Z,” semi-circle or stutter-step pattern. It is important to remember that the aforementioned side-to-side SPEED OF TRAVEL Finally, there is the speed of travel. This is a key ingredient to getting the correct weld. Your travel speed should allow you to keep the arc in the leading one-third of the weld pool. If you travel too fast, then penetration decreases, which affects the integrity of the weld. It can underfill, which is when the outside of the weld is recessed. If the user is travelling to slow, it produces a convex bead with little penetration. It looks like the weld is sitting on the surface of the metal and has not joined the two pieces together. motion should be limited to twice the diameter of the electrode core. To cover a wider area, make multiple passes or use “stringer beads”. If welding vertical up, the focus should be on welding the sides of the joint, because the middle will take care of itself. Remember, when moving across the middle of a joint it is done at a pace that allows the weld puddle to catch up. Then pause at the sides to allow a solid tie-in to the side wall. If welds look like they have overlapped, then the user has gone forward too fast and didn’t hold on the sides as long as necessary. HUGE SAVINGS BY UPSKILLING YOUR WELDING STAFF Paying contractors for onsite welding work can be expensive. The alternative of finding training that fulfils the requirements needed to upskill your staff and meet your needs can be equally challenging. The solution is Auckland Welding School, a company specialising in teaching all types of commercial welding since 2005.The school provides training for beginners and comprehensive courses for welders who want to improve their skills. The specialist stainless steel welding course is ideal for those wanting to upgrade to dairy tube in a short time-frame. “Our welding courses are intense, hands on training that teaches the practical needs required within the industry,” says Rocke Bryers of Auckland Welding School. Students learn welding safety, tool requirements and preparation. They also learn many ‘trade secrets’ from tutors who have more than 20 years’ experience in stainless steel tube welding. The 12 lessons of two hours are a precursor to the industry recognised certification test. Auckland Welding School’s courses are supervised by highly-skilled, industry-trained tradespeople and most welding gear, machinery and materials are supplied. EXTRACTION filters collectors filters valves management BOOTHS booths lines bake booths rooms stations manufactured to AS/NZ 4114 components reducing branches dampers and more EXTRACTION SYSTEMS fume arms feeder mounts systems extraction DUST EXTRACTION Reverse pulse bag filters Camfil Gold series collectors Cyclone and static filters Fans and rotary valves Design build – project management SPRAY BOOTHS Kit set open face booths Auto spray lines Heated spray and bake booths Heated drying rooms Paint work stations Spray plenums designed manufactured to AS/NZ 4114 V-DUCT Modular ducting components Pipes-bends-clamps-reducing branches Diverter valves – dampers and more WELDING FUME EXTRACTION SYSTEMS Articulated welding fume arms Extension booms with wire feeder mounts Centralised systems Robot welding station extraction EN061
EN-June2017-eMag2
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