Welding operation process of stainless steel coil and post-weld solution treatment

The latter half of the stainless steel coil operation resembles the front half, but requires two bead joints. Of these, the upper weld joint proves more challenging than the flat joint and is pivotal for welding the entire horizontal fixed pipe. For easier jointing, when welding the front half, ensure the flat welding end sits 5-15mm above the vertical centerline of the coil. When handling the joints, grind approximately 10mm of the weld at the start of the coil with an angle grinder to create a gentle slope. When ready to weld the joints, preheat the joint using a long arc to bake it first. As you transport the filler material to the center of the joint, flatten the welding rod immediately to press the molten metal. Avoid extinguishing the arc; instead, push the welding rod upward to break through the un-melted root and achieve full fusion of the coil joints. When the welding rod reaches the oblique vertical welding position, employ top arc welding—tilt the rod forward while slightly swinging it horizontally. About 3-5mm before closing the joint, do not extinguish the arc. Instead, press the rod inward and listen for the "puff" sound indicating the arc has broken through the root. Swing the rod back and forth at the joint to ensure complete fusion of the stainless steel coil joint, then fill the arc pit and guide the arc to one side of the weld to extinguish it. The intermediate and cover layers also begin from the back welding site and terminate at the same level. Start the coil's weld thinly to prevent the formation of weld tumors. The intermediate weld bead should not protrude excessively, and its height should be carefully controlled during the cover layer. Moreover, the overhanging area shouldn’t be too high, maintaining consistency with the height and width of the flat and vertical welds. When welding vertically fixed stainless steel pipe bends, the bevel matches the assembly and fixed coils. For the base weld, select the starting point, initiate the arc using the direct hit method, elongate the arc to heat the bevel until it approaches melting, lower the arc to form a molten pool, then advance using a straight or spiral motion. When switching welding rods in stainless steel coils, act quickly. Re-ignite the arc before the weld cools to facilitate jointing. After finishing, return to the initial welding point. Upon hearing a breakdown sound, swing the rod slightly, fill the arc pit, and extinguish the arc. The base weld bead should sit slightly lower with no sharp corners on top and no adhesion below. For the intermediate layer weld bead of the stainless steel coil, use an oblique zigzag or oblique circular strip pattern. This approach minimizes bead count, reduces defect chances, boosts efficiency, ensures uniform welding waves, yet demands more skill. If multi-pass welding is used, increase the current slightly and transport the strips linearly to ensure thorough melting. Welding speed should remain moderate to arrange weld beads neatly and compactly from bottom to top. Adjust the vertical inclination of the welding rod according to its position; lower angles should be larger and upper angles smaller. Throughout the process, keep the molten pool clear. When slag and molten metal mix, manipulate the weld beads to appear convex, leaving slag shells intact between beads to allow gradual cooling and ease of fusion. The inclination angle of the final rod should be small to eliminate undercutting. In real-world scenarios, such welding techniques require practice and patience. Each welder develops their own rhythm, balancing speed and precision. Remember, maintaining cleanliness of tools and ensuring proper ventilation are crucial for safety.

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