What is the reason for the hard alloy blade to be welded to the pole?
The alloy and the pole are not cleaned and the copper and alloy are not firm. The alloy is carburized and decarburized, which causes the alloy to bubble in large quantities during welding. 3, the welding process is improper, the bubble that produces in the welding process is not come out.
Welding quality problem. Hard alloy tool head, tool bar belongs to foreign metal welding, now mainly has: gas welding brazing and high frequency welding. Gas welding brazing is using oxyacetylene flame (or oxygen propane etc) welding, heat tool rod alloy tool bit, using the copper wire dips in flux flux (copper, borax boric acid equal parts mixed flux, borax) a welding process, welding copper wire melting point is lower than the tool holder, segment, using the capillary action for brazing welding effect. The flame leaves the molten pool in the welding process, and the protection of the air is not strong enough to cause the welding. It is necessary to clean up the welding quality before it can be soldered. High frequency brazing is the use of silver soldering terminal (copper welding pieces of external coating with silver) as a tool holder, cutting head solder, using high-frequency alternating current heating temperature, silver welding molten brazing welding effect. Incorrect selection of welding parameters and poor quality of silver welded plates will also cause the welding to be unstable. Before welding, tool tip is also cleaned up.
The temperature is not enough to mix well. Knife rod burning red first, put some borax points on copper strip, copper to see good fusion to the tool holder, put in the blade, the time not more than a minute, with every where in every bits of bit copper bar
