Key Considerations for Welding Hastelloy Pipes 1. Welding Procedure for Hastelloy Pipes During the welding of Hastelloy pipes, it's important to carefully handle the white tape that is often placed along the groove's bottom and sides. This tape should be removed or reversed before welding. If not, it must be cleaned thoroughly with acetone prior to the welding process to avoid contamination. 2. Proper Welding Technique When welding, use a lower power setting to maintain control over the heat input. The end of the welding wire that becomes heated must always remain within the protective gas shield. Throughout the entire welding process, short arc welding should be used to regulate the temperature between each pass. When the arc is turned off, the crater should be filled completely, and the shielding gas should continue for at least 30 seconds to prevent hot cracking. 3. Avoiding Tungsten Inclusion The tungsten electrode must never come into contact with the molten pool or the welding wire. Keep the arc length as short as possible to prevent tungsten from being incorporated into the weld, which can weaken the joint and cause defects. 4. Controlling Welding Speed It's crucial to maintain an appropriate welding speed. A slower speed increases the energy input, leading to excessive melting and potential loss of alloy elements in the weld metal. This can result in an overheat-affected zone with larger grain structures, reducing the mechanical properties of the welded joint. On the other hand, a very fast speed may lead to poor fusion at the edges, incomplete penetration, and the formation of crater cracks due to insufficient heat and poor metallurgical reactions. 5. Welding Safety and Equipment Welding supervisors and technicians should wear proper gloves and safety accessories to ensure protection during the process. When filling the crater, extra care should be taken to avoid cracks forming in the area. A windscreen should be placed around the welding site to protect the molten pool from external air currents. The gap between the windscreen and the pipe should be maintained at 1–2 mm, ideally between 0–1.6 mm. The weld surface must be free from cracks, lack of fusion, undercut, porosity, and slag inclusions. It should also show good penetration when inspected using X-ray or other non-destructive testing methods. 6. Quality Assurance All on-site welds must undergo radiographic inspection to ensure they meet quality standards. The first-pass acceptance rate and the surface quality of the welds must comply with the required specifications to guarantee structural integrity and long-term performance. 13mm Ferro Calcium Cored Wire,30 Ferro Calcium Cored Wire,30 feca cored wire,ferro calcium wire ANYANG TIEFA METALLURGY CO.,LTD , https://www.ferroalloytiefa.com