The method of gas welding alloy cutter heads, how to weld cemented carbide cutter heads

Materials Required: Oxygen, acetylene gas, welding gun, borax, brass electrode, gas welding goggles, tweezers. The key to gas welding is to adjust the flame and master the heat

Step 1: Grind the tool holder on the grinding wheel to produce a metallic luster, which is convenient for welding;

Step 2: First, burn the place where the blade is welded (about 700, the color is dark red) and put it into the brass wire;

Step 3: Wait for the copper wire to melt and spread on the welding surface of the cutter holder, (when heating the cutter bar, burn the surrounding first, never burn the place where the welding rod is just placed, the copper water does not have to be too thick, but it needs to be flat, otherwise the cutter head is not easy to place);

Step 4: Leave the welding gun, sprinkle a little borax, and use tweezers to put the alloy cutter head well, (after the welding rod and the cutter head are connected, you can grasp the angle of the cutter head at will when welding the cutter, and pay attention to the cutter head can not burn too red when connecting, as long as it can be connected);

Step 5: Heat the joint between the cutter head and the cutter bar, which is on the top of the cutter bar, (not at the part of the cutter tip) so that the cutter bar and the cutter head are heated at the same time, when the cutter bar and cutter head reach 800. Put in the brazing electrode, and the brazing electrode melts and flows into the gap between the cutter head and the cutter holder; Note:

If the blade is different from the head color when the bit is placed, a fourth step is required. Step 5: Heat the blade around the blade first, and swing the flame to the cutter head from time to time, when the cutter head and the cutter bar are red, and the color is consistent, the cutter head will naturally stick to the cutter holder, at this time, you can adjust the angle of the cutter head at will, until you are satisfied.

First, make the tool holder and let the gas welding heat to about 700 degrees Celsius, then put the solvent on the tool head and put it directly on the tool holder, and finally add copper. But you have to keep the flame 3 4 often on the sitting, otherwise there will be no welding or cracking of the alloy bit.

Welding rods alone will not work.

Tungsten carbide cutter bits can be divided into the following welding methods according to the performance requirements: 1. VOD201 welding wire with VOD201-F flux welding, the welded color is brass color, and the working melting point is relatively high.

2. VOD203 high-silver welding wire has a relatively low working melting point and good operability, but the price is relatively high.

3. WE46 is used to replace high-silver welding wire to weld, solve the dissimilar welding between Monel, white copper, carbon steel, stainless steel, and the above metals, the strength is very high, but the melting point is relatively high.

1. The structure of welded cutting tools should have sufficient rigidity.

Sufficient rigidity is ensured by the maximum permissible dimensions and the use of higher strength steel grades and heat treatments.

2. The cemented carbide blade should be fixed firmly.

The tungsten carbide welding blade should have enough fixing firmness, which is guaranteed by the tool groove and welding quality, so the blade groove shape should be selected according to the blade shape and tool geometric parameters.

Before welding the blade to the tool holder, it is necessary to carry out the necessary inspection of the blade and the tool holder, and the first thing to check is that the blade bearing surface can not be seriously bent. The tungsten carbide welding surface shall not have a serious carburizing layer, and the dirt on the surface of the hard alloy blade and the groove of the cutter bar should be removed to ensure that the welding is reliable.

3. Requirements for soldering solder.

In order to ensure the strength of the weld, the appropriate solder should be selected. In the welding process, good wetting and fluidity should be ensured, and air bubbles should be eliminated, so that the welding and the alloy welding surface are in full contact with each other, and there is no lack of welding.

4. Requirements for soldering flux.

It is recommended to use industrial borax, which should be dehydrated in a drying furnace before making the acacia used, then crushed, sieved to remove mechanical debris, and set aside.

In order to reduce the welding stress, it is recommended to use a thin sheet with a thickness or a mesh compensation gasket with a mesh aperture of 2-3mm for welding high titanium and low cobalt fine grain alloys and welding long and thin alloy blades.

Due to the brittleness of cemented carbide inserts and their strong sensitivity to crack formation, the tool should avoid overheating or quenching during the grinding process, and at the same time, it is necessary to choose a grinding wheel with appropriate particle size and a reasonable grinding process to avoid grinding cracks and affect the service life of the tool.

When installing the tool, the length of the cutter head extending out of the tool holder should be as small as possible, otherwise, it is easy to cause the tool to vibrate, thereby damaging the alloy sheet.

When the tool is used to achieve normal grinding, it must be re-sharpened, and the re-sharpened tool must be ground with a stone on the cutting edge and the tip of the knife, which will improve the service life and safety and reliability of the tool.

Flame brazing, using copper as the brazing metal.