Method for repairing cracks of circular saw blade through welding

A welding repair and circular saw blade technology is applied in the tool dressing, welding medium, welding equipment and other directions of the sawing machine device, which can solve the problem of poor weldability of carbon tool steel, alloy tool steel and spring steel, and inconvenience and troublesome repair of circular saw blades. , circular saw blade welding to repair cracks and other problems, to achieve the effect of low welding repair cost, saving welding material consumption, and reducing welding defects

Inactive Publication Date: 2021-04-20
日照唐晟锯业有限公司
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Problems solved by technology

[0004] As we all know, the weldability of carbon tool steel, alloy tool steel and spring steel is very poor, and the structure of large and thin circular saw blades is extremely prone to cracking during welding. Therefore, the biggest problem of circular saw blade welding repair is how to solve it first. Problems with cracks during welding
It is very difficult to weld carbon tool steel, alloy tool steel and spring steel by fusion welding. This is because such materials have a large tendency to harden the structure and welding stress, so the sensitivity to cold cracks is high, and the condition for the formation of welding cold cracks is quenching. Hard tissue, restraint stress and diffusible hydrogen, so preheating, slow cooling process and selection of high-quality welding materials are often used to reduce the tendency of hardened structure and welding stress, so as to avoid the generation of cracks, but the pre-welding of the workpiece The successful experience of the heat temperature is required to be above 400°C, but if the circular saw blade is welded under high temperature preheating conditions above 400°C, it is difficult for the welder to approach the circular saw blade for continuous construction operations, especially the welding of large diameter circular saw blades. Unless a thermal insulation construction bench is built, this will bring great inconvenience and trouble to the repair of circular saw blades, thereby increasing the difficulty of welding operations, prolonging the repair period and increasing the cost of repair, which is why no one is currently repairing circular saw blades. Therefore, how to reduce the preheating temperature is the key to solve the problem under the premise of ensuring no cracks and other defects in the welding process, but so far, there is no effective method to solve this problem. One problem, the method of welding and repairing cracks in circular saw blades at a lower preheating temperature is still blank

Method used

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  • Method for repairing cracks of circular saw blade through welding
  • Method for repairing cracks of circular saw blade through welding
  • Method for repairing cracks of circular saw blade through welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]SeeFigures 2 to 11 In the present embodiment, the circular saw blade 1 thickness is 6 mm, the diameter φ2200 mm, the material is carbon tool steel, and the crack 2 shown is cracked during the graft of the circular saw blade, and the crack direction is irregular.

[0043]Welding repair method for circular saw cracks, according to the following steps:

[0044]Welding method: use DC welding machine to reverse the polarity manual arc welding.

[0045]Welding material: use the low hydrogen type of the weld metal and the saw blade metal, high toughness flat welding strip 10, the flat welding strip weld metal tensile strength 830 MPa, the electrode is 2mm × 4mm, the electrode has good Welding process performance and crack resistance, drying temperature 300 ° C before welding, heat insulation, then put it in the thermal insulation barrel.

[0046](1) Reprinches oil: Wire wire brush to clear the circular saw blade 1 to 100 mm in the range of 100 mm in the range of 100 mm, without rust, etc., the d...

Embodiment 2

[0062]SeeFigures 2 to 13In the present embodiment, the circular saw blade 1 thickness is 10 mm, the diameter φ3600mm, the material is alloying tool steel, and the crack 2 shown is cracked during the quenching process of the circular saw blade, and the crack direction is irregular.

[0063]Welding repair method for circular saw cracks, according to the following steps:

[0064]Welding method: use DC welding machine to reverse the polarity manual arc welding.

[0065]Welding material: use a low hydrogen type with a weld metal and a saw blade metal, a high toughness flat welding strip 10, a flat-shaped electric welding strip welded metal tensile strength of 850 MPa, the electrode specification is 2mm × 4 mm, which has good Welding process performance and crack resistance, drying temperature 300 ° C before welding, heat insulation, then put it in the thermal insulation barrel.

[0066](1) Reprinches oil: The steel wire brush is used to clean the circular saw 1 crack 2 peripheral to clean, and there...

Embodiment 3

[0084]In the present embodiment, the circular saw blade is 8mm, the diameter is φ3000mm, the material is spring steel, the groove opening width is 6mm, the thickness of the slope is 1.5 mm, and the tensile strength is 800MPa, the electrode is 2mm × 4 mm flat electric welding strip, according to the Example 2 Method was carried out by a circular saw crack, and it was qualified by the weld inspection.

[0085]In summary, the above process method has been used, and the welding repair of circular saw blades has been well used in production. Practice has proved that the welding repair is 100%, but sometimes it is 100% in accordance with the operation of this process. Since the welder will have a defect of welding bite, if it is discovered early, it can be soldered immediately to make up the error, and it will not affect the repair quality.

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Abstract

The invention discloses a method for repairing cracks of a circular saw blade through welding, and particularly provides a manual arc welding process method capable of repairing crack defects of the circular saw blade at a lower preheating temperature. The method is characterized in that a welding material is a flat welding electrode capable of realizing narrow-direction strip conveying method welding and wide-direction strip conveying method welding; narrow and small grooves are welded; weld joint stress is eliminated through vibration impact; a bottoming weld joint and a filling weld joint are welded through a narrow-direction strip conveying method, and a cap weld joint is welded through a wide-direction strip conveying method; and the preheating temperature of the circular saw blade is 100 DEG C, and the welding repair temperature is kept at 80-100 DEG C. According to the method, the problem that the welding preheating temperature is too high is effectively solved, meanwhile, the welding operation is as simple, convenient and feasible as common welding, effective welding repair of the cracks on the circular saw web can be achieved, and the method has very high practical value and economic benefits.

Description

Technical field[0001]The present invention relates to the field of welding technology, in particular a welding repair method of a circular saw blade crack.Background technique[0002]Currently, circular saw blade has been widely used in steel, aluminum, stone and wood and other cutting processes. Generally, the thickness of the circular saw blade is between 2.0 mm to 17 mm, and the diameter is between φ300mm to φ5200 mm; the circular saw blade is made of carbon tool steel, alloy tool steel or spring steel. The structural characteristics of the circular saw blade are large and thick, and the material characteristics of the circular saw blade are high strength, rigidity and hardness, high carbon content and alloy content, easy to quench, and poor welding.[0003]Due to the factors of the structure and material characteristics of the circular saw blade, it is easy to generate transparent cracks in some parts of the circular saw blade, and the uncertainty of crack cracking is long and the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/235B23K35/04B23P6/04B23D63/00
Inventor 郭毅安永亮田永波窦玉莲安凤占郭面焕
Owner 日照唐晟锯业有限公司
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