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The rear portion of the stainless steel coil operates similarly to the front half but requires two bead joints. Of these, the upper weld joint proves more challenging than the flat joint, acting as the critical step in welding the entire horizontal fixed pipe. To facilitate the joints, during the front half’s welding, the flat welding end should sit 5-15mm above the vertical centerline of the stainless steel coil. For the joints, grind out approximately 10mm of the weld at the start of the coil using an angle grinder to create a gentle slope. When welding the joints, preheat them using a long arc to bake the joint areas first. As you transport the filler to the center of the joint, flatten the welding rod immediately to press the melted metal. Avoid extinguishing the arc and push the welding rod upward to break through the un-melted root, ensuring complete fusion of the stainless steel coil joints.
When the welding rod reaches the oblique vertical welding position, employ top arc welding—tilt the welding rod forward while making slight horizontal swings. Approximately 3-5mm before the joint closure, do not extinguish the arc. At this stage, press the welding rod inward; you’ll hear the “puff†sound of the arc breaking through the root. Swing the welding rod back and forth at the joint to ensure full 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 at the back welding site and terminate at the same level. The starting point of the stainless steel coil should be welded thinly to prevent welding tumors. The intermediate layer of weld meat should not protrude excessively, and its height should match the cover layer. Additionally, the overhanging welding area should not be too high and should align with the height and width of the flat and vertical welds.
When welding vertically fixed stainless steel pipe bends, the bevel is identical to the assembly and fixed coils. For the base weld, select the starting point first, ignite the arc using the direct hit method, elongate the arc to heat the bevel, wait for the bevel to approach melting, lower the arc to form a melt pool, and then move forward in a straight line or spiral motion. When changing welding rods in stainless steel coils, act quickly. Before the weld cools, reignite the arc to facilitate joining. After welding, return to the initial welding point. Upon hearing a breakdown sound, swing the welding rod slightly, fill the arc pit, and close the arc. The base weld bead should be slightly lower in profile, without sharp corners on top or adhesion on the bottom.
The intermediate layer weld bead of the stainless steel coil can be achieved using oblique zigzag or oblique circular strips. This technique involves fewer beads, reducing defect opportunities, improving production efficiency, and creating uniform welding waves, though it’s trickier to execute. If multi-pass welding is applied, increase the welding current slightly and transport the filler in a straight line to ensure full melting of the weld beads. The welding speed of stainless steel coils should not be too fast to ensure neat and compact stacking of weld beads from bottom to top. Adjust the vertical inclination of the welding rod according to its position: the lower inclination angle should be larger, while the upper inclination angle should be smaller. Throughout the welding process, maintain clarity of the melt pool. When slag and molten metal mix, some convexity can be created in the weld beads, leaving slag shells intact between beads to allow slow cooling and easier fusion of weld beads. The inclination angle of the final welding rod should be small to eliminate undercutting.
As an additional tip, always ensure proper ventilation and wear protective gear during welding to safeguard against fumes and sparks.
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