The Technology of Welding Stainless Steel Cylindrical Parts on Cemented Carbide Long Thin Wall Parts

Abstract

The invention relates to a technology for welding a cylindrical stainless steel part on a long-strip-shaped hard alloy thin-wall piece. The technology comprises the steps that the pre-processed long-strip-shaped hard alloy thin-wall piece is placed into a quenching furnace to be heated to 400-450 DEG C along with the furnace; the long-strip-shaped hard alloy thin-wall piece is taken out of the furnace rapidly, the stainless steel cylindrical part is located at a to-be-welded position quickly and heated through flame, the periphery of the flame is made to perform circular motion around the circumference of the stainless steel cylindrical part, the flame needs to deviate towards one side of the long-strip-shaped hard alloy thin-wall piece appropriately, when the stainless steel cylindrical part is heated to 650-800 DEG C, solder bond flux is molten into weld seams rapidly, it needs to be guaranteed that welding is completed within the temperature range, and the flame is stopped immediately after the weld seams are filled with solder; after the flame is stopped, the welded workpiece is immediately placed into the furnace at the temperature of 350-450 DEG C to be tempered for 5-8 hours. The technology for welding the stainless steel cylindrical part on the long-strip-shaped hard alloy thin-wall piece solves the problem of welding stainless steel dissimilar metal to long-strip-shaped hard alloy thin-wall pieces, and prevents hard alloy from having the defects that cracks are generated and the hard alloy is over-burnt and cannot be fused.

Description

technical field [0001] The invention relates to a welding process, in particular to a process for welding a stainless steel cylindrical part on a hard alloy long thin-walled part. Background technique [0002] Welding stainless steel cylindrical parts on long thin-walled carbide parts, such as welding stainless steel inner wire nuts on cigarette machine alloy knives (cutters used in cigarette factory production), is the last step in processing the entire cigarette machine alloy knives into finished products. The hood alloy is generally YL10.02 hard alloy, and the blade is thin and long, with a blind hole in the middle and two ends. Put a stainless steel cylindrical nut (such as 1Cr17 stainless steel, with a chamfer of 1×45° at the bottom of the nut) into the blind hole of the hood alloy knife (the depth of the blind hole is only 1mm), even if it is placed by hand, put the nut It is very difficult to place it straight and in the right position. Finally, the nut is fixed on ...

AI Technical Summary

Problems solved by technology

YL10.02 cemented carbide is a fine-grained cemented carbide, which is most likely to produce cracks in brazing welding. For the welding of long thin-walled YL10.02 cemented carbide, due to the uneven heating temperature of the blade, the alloy often The internal stress of the blade is more likely to cause cracks, and the pass rate is only about 60%, which is a huge waste of cost

At the same time, it is difficult to weld dissimilar metals between YL10.2 and 1Cr17 stainless steel, and the welding temperature cannot be controlled, resulting in desoldering, and ferritic stainless steel often forms an oxide layer on its surface during welding, which brings many difficulties to brazing

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