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Method for welding large-size tantalum strips

A welding method and large-scale technology, applied in welding equipment, resistance welding equipment, metal processing equipment, etc., can solve problems such as inability to weld tantalum bars

Active Publication Date: 2013-08-21
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cold welding method of Φ3mm tantalum rods can satisfy the welding of small diameter tantalum rods, but it is impossible to weld tantalum rods of Φ4mm or more than 4×4mm

Method used

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  • Method for welding large-size tantalum strips

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First cut off the cracked part of the diamond-shaped tantalum bar with a side length of 4×4mm to ensure that the broken end of the tantalum bar is free of cracks, hollows and black centers. Strictly remove oil and other pollutants within 30mm of the welding part, and wipe with alcohol to ensure that the welding area is clean.

[0027] Then clamp the two ends of the two 4×4mm diamond-shaped tantalum bars with the two electrodes of the butt welding machine respectively, and connect the two electrodes to the transformer of the butt welding machine, so as to generate clamping force above the tantalum bars. The protruding length between the electrodes is L=6mm, the flash margin Δf=1.5mm, and the upsetting margin Δup=4.5mm.

[0028] The preheating of the welding material before welding is carried out on the butt welding machine. After the temperature of the end surface of the weldment is raised to a suitable value through preheating, the flashing and upset forging process is ...

Embodiment 2

[0030] First, cut off the cracked part of the diamond-shaped tantalum bar with a side length of 6×6mm to ensure that the broken end of the tantalum bar is free of cracks, hollows and black centers. Strictly remove oil and other pollutants within 30mm of the welding part, and wipe with alcohol to ensure that the welding area is clean.

[0031] Then two 6×6mm rhombic tantalum strips are respectively clamped by the electrodes, and the two electrodes are connected to the transformer of the butt welding machine, and the clamping force is generated above, and the two ends of the tantalum strips protrude between the two electrodes with a length of L=8mm, flash allowance Δf=1.8mm, upsetting allowance Δup=4.7mm, the welding material is preheated on the welding machine, and the temperature of the end surface of the weldment is raised to a suitable value through preheating, and then Perform flashing and upsetting process. At the end of the preheating phase, the end face of the rod mater...

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Abstract

The invention relates to a method for welding rolled tantalum strips in a flash butt welding mode, in particular to a method for welding large-size tantalum strips. The method is characterized by comprising the following steps that two tantalum strips which are rolled are combined to form a butt welding head, two ends of the butt welding head are respectively clamped tightly by two electrodes of a but welding machine, upsetting force is exerted to the two ends of the butt welding head, the end faces of the but welding machine gradually move closely to achieve partial contact, a power source is then connected, a resistance heat heating contact is used for generating flash to melt the contacted end faces, and when a preset temperature is reached, and the upsetting force is exerted quickly to the two ends of the butting welding head so that welding can be completed. Cold welding is adopted in a traditional method for welding the tantalum strips belongs to, and due to the fact that tantalum strips with sizes lower than pi 3mm are only suitable for domestic cold welding devices, tantalum strips with sizes higher than pi 4mm or 4*4mm cannot be welded. The problem of welding of the tantalum strips with the sizes higher than pi 4mm or 4*4mm is resolved and feasibility is provided for continuous rolling or drawing of the large-size tantalum strips.

Description

technical field [0001] The invention relates to a method for welding rolled tantalum bars by flash butt welding, in particular to a welding method for large-size tantalum bars. Background technique [0002] The tantalum bar for the production of tantalum wire is generally rolled to 3×3mm or Φ3mm for cold welding. Generally, the cold welding is below Φ3mm, and when the tantalum bar is rolled to 3×3mm, the weight of the sintered tantalum rod for rolling the tantalum bar is usually 5 -8kg, in general, several tantalum strips are compiled into a batch, with several solder joints in the middle. At present, the cold welding method of Φ3mm tantalum rods can satisfy the welding of small-diameter tantalum rods, but it is impossible to weld tantalum rods of Φ4mm or more than 4×4mm. [0003] With the advancement of tantalum wire production technology, all manufacturers are committed to improving production efficiency, improving product quality, reducing production costs, and improving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/04
Inventor 张晓万庆峰郭林波刘云峰解永旭陈林马跃忠韩鹏
Owner NINGXIA ORIENT TANTALUM IND
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