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Restoring method of welding broken high-speed steel

A welding repair, high-speed steel technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve problems such as poor welding performance

Active Publication Date: 2017-06-09
CHAIRBORNE MACHINERY LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention proposes a fractured high-speed steel welding repair method, which solves the problem in the prior art that the saw blade made of high-speed steel as an integral material has poor welding performance during fracture welding repair

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  • Restoring method of welding broken high-speed steel

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Embodiment

[0025] The present invention takes the bow saw blade as an example, and specifically describes its welding repair method as follows:

[0026] 1. Preparation and cleaning of joints before welding

[0027] Joint preparation: If the fracture to be repaired by welding is regular, only the fracture needs to be compounded. If the fracture is irregular, it is necessary to use a grinding wheel slicer to straighten the two irregular fractures, and for fracture deformation at the fracture, it also needs to be corrected.

[0028] Joint cleaning: After the preparation of the butt joint, it is necessary to clean up the oxides, oil, slag and other harmful substances within at least 20mm near the front and back of the saw blade joint. When cleaning, you can use a table grinding wheel or an angle grinder derusting wheel to clean the welding area so that the welding area reveals a metallic luster, then use absorbent cotton dipped in a small amount of acetone to wipe the welding area clean, an...

example

[0044] Use NBC-350 carbon dioxide gas shielded welding machine to repair and weld 450×35×1.8×4 broken saw blades. The welding current is 120A, the voltage is 19V, the welding wire diameter is 1.0mm, the welding wire is ER50-6, the shielding gas is pure carbon dioxide, and the flow rate is 10L / min. The saw blade repaired by welding can fully meet the sawing of carbon steel materials on the bow sawing machine.

[0045] The method of the present invention is also applicable to other tools made of high-speed steel as a whole material.

[0046] Table 1 Chemical Composition of Welding Wire ER50-6

[0047]

[0048] Table 2 Mechanical properties of deposited metal of ER50-6 welding wire

[0049] performance Tensile strength / σ b

Yield strength / σ 0.2

Elongation / δ5, (%) ≥500MPa ≥420MPa ≥22

[0050] Table 3 welding process parameters

[0051] CO2 gas flow Welding current arc voltage power polarity Wire direct Nozzle to working...

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Abstract

The invention relates to a restoring method of welding broken high-speed steel, which includes the following steps: joints are prepared and cleaned before welding; welding joints are coupled; welding material is chosen; welding craft parameter is selected; the specific welding operation is proceeded; welded work pieces are reground and shaped; the defective joints are repaired and welded. The restoring method of welding broken high-speed steel discloses that during the process of restoring and welding saw blades, using the gas metal arc welding which produces less imported quantity of heat by adopting the electric arc to heat intensively can solve the problems that the present welding technologies produce bigger joint brittle zone because more quantity of heat is imported during the process of welding high-speed steel and cracks caused by the residual stress and bigger distortion. The method of using carbon dioxide to protect welding and restore the machine saw blades of the high-speed steel has the advantages of being easy to process and low in restoring cost.

Description

technical field [0001] The invention belongs to the repair manufacture of alloy tool steel, and in particular relates to an arc welding realizing high-speed steel tool material, and the method can be used to weld tools of high-speed steel alloy material with a thickness of less than 3mm, such as hacksaw blades. Background technique [0002] High-speed steel, also known as sharp steel or white steel, is a complex alloy steel containing carbide-forming elements such as tungsten, molybdenum, chromium, vanadium, etc., and the total amount of the alloy is about 10-25%. Its hardness can reach HRC63-66 at normal temperature, and the hardness can still reach HRC48.5 at 600°C. It can fully meet the requirements for the hardness of the cutter head under the condition of high-speed mechanical cutting (about 500 ° C), and become a steel for high-speed cutting. W18Cr4V is the most typical high-speed steel. Due to the low bending strength of high-speed steel, generally only 2.94-3.33MPa,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/04B23K9/16B23K9/235B23K103/04
CPCB23K9/16B23K9/235B23K2103/04B23P6/04
Inventor 蒋应田单智琦李帅宋一吟吴江华郭天池刘宇志王运玲李宪臣
Owner CHAIRBORNE MACHINERY LIAONING