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Silicon-carbon bar integral welding technology

A silicon carbide rod and process technology, applied in welding equipment, manufacturing tools, non-electric welding equipment and other directions, can solve the problems of poor appearance, concentration, oxidation stress of welding points, etc., and achieve the effect of reducing energy consumption

Inactive Publication Date: 2008-01-16
潘劭华 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the local welding method also has obvious shortcomings, that is, the appearance near the welding point is poor, and there are local oxidation and stress concentration phenomena.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The overall welding adopts a batch-type resistance furnace heated by carbon plates, the inner chamber size is length * width * height = 1500 * 500 * 300mm, and the protective atmosphere is 99.999% high-purity nitrogen. The temperature was raised to 2100°C in 5 hours. The sagger is a rectangular graphite box with dimensions of length × width × height = 1400 × 350 × 70mm, and is placed in the furnace in three layers. 8 pieces of 25 / 500 / 400 / 38 thick-end rods are placed in the lower sagger, 15 20 / 600 / 350 equal-diameter rods are placed in the middle sagger, and U30 / 700 / 350×2 / 60 U-shaped rods are placed in the upper sagger 3 sticks. Keep it constant for 25 minutes at a high temperature of 2100°C. Then power off to cool down. Continue to fill with high-purity nitrogen during the cooling down process. Furnace temperature below 200 ℃ out of the furnace.

[0024] The rod body after the overall welding is tested, and the solder joints are firm, and the main perf...

Embodiment 2

[0025] Embodiment 2: The overall welding adopts a carbon tube heating continuous tunnel furnace, the inner chamber size diameter × length = φ200 × 3500mm, the furnace temperature is 1900 ° C, and 99.999% high-purity argon is filled as a protective gas. The sagger is a graphite round tube with a size of Φ150×1700mm, and contains two 30 / 900 / 350 equal-diameter rods. The time for the sagger to pass through the high temperature zone is 20 minutes. After the rod is tested, the performance index meets the requirements of the silicon carbide rod industry standard.

Embodiment 3

[0026] Embodiment 3: An induction heating furnace is used for overall welding, and the inner chamber size diameter×height=Φ400×1200mm. The furnace is vacuum, and the vacuum degree is -0.098MPa. The sagger is a graphite tube with a size of Φ300×1150mm, 2 vertically placed 25 / 500 / 400×3 / 60 mountain-shaped sticks, 2 20 / 265 / 430×3 / 64 mountain-shaped sticks, 30 / 455 / 250× 4 pcs of 2 / 60 gun-shaped sticks. Keep it constant for 15 minutes at a high temperature of 1800°C. After cooling, it is tested and sprayed aluminum, and the performance index meets the requirements of the industry standard.

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PUM

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Abstract

The invention adopts a whole flame sterilization welding technology of a carborundum heating element, a silicon carbide bar, to replace a partial welding technology of the silicon carbide bar. The heated processes of any part of a bar billet in the high temperature are the same in the welding process. A kiln of the whole flame sterilization welding can be intermittent or of a tunnel type. The whole flame sterilization welding is non-oxidative. The temperature of the whole flame sterilization welding is from 1600 to 2400 DEG C and the time is 10 to120 minutes in the high temperature. The whole flame sterilization welding solves the problem that the stress is concentrated near the welding surface of the bar and the appearance of the welding surface of the bar is not good in the partial welding. The finished silicon carbide bar wholly flame sterilization welded by the invention has good appearance, good quality and reliability. In the conditions that a single bar has a plurality of connecting surfaces and the total length of the bar is shorter in the mass flame sterilization welding, the whole flame sterilization welding consumes less energy than the partial welding.

Description

technical field [0001] The invention relates to the production technology of silicon carbide electric heating element—silicon carbon rod. Background technique [0002] Silicon carbide heating element - silicon carbide rod is a non-metallic heating element, and its types mainly include silicon carbide rods with equal diameters, silicon carbide rods with thick ends, U-shaped silicon carbide rods, mountain-shaped silicon carbide rods, and five-segment rods ( Double heating zone straight silicon carbide rod), threaded rod and various special-shaped heating parts. The main structure of the silicon carbide rod is composed of a heating part and a cold end part, and these two parts are sintered at high temperature - welding process to become a finished rod. At present, domestic silicon carbide rod manufacturers mostly use a vacuum welding process that locally heats the connection, and some manufacturers use a gas shielded local welding process. What they have in common is the inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/22B23K20/26B23K20/14
Inventor 潘劭华赵强张强徐涛
Owner 潘劭华