How to weld a car knife with copper
It's best to have the first one, plus borax, and then put in the head of the knife, which is very strong
Apply the copper to the knife and place the head on the top of the knife, which is used to weld the width of the knife Put the head of the knife on the knife plate to heat to the red, and then melt the copper to the end of the knife with the copper electrode, which is used to weld the narrow head
For wider blades, use the first method you say, and for narrower blades such as cutting knives. The reason is to use the first method to ensure that there is copper contact on the blade, even though the area that is worn in the use of the blade can still guarantee the welding. In the case of smaller blades, the latter method is easier to operate, and it is effective to avoid the phenomenon of the blade overburn because of the over-heating time. And the blades themselves are narrower, and the copper is easily filled with blades, which makes it difficult to produce the local copper shortage of a large blade.
Use oxyacetylene or oxypropane to heat up the knife. Copper wire dipped in copper flux (borax boric acid is also used for the equal mixing, replace copper flux. The most time with borax flux), the temperature is too high can raise the torch, the flame will always shrouded blade Between the cutting head, to avoid being air intrusion. The copper wire flux is put into the head of the knife. You can do the welding.
The lathe USES the head of a lathe, which belongs to high speed steel, such as W18Cr4V, which is a kind of metal. Welding, the most common is copper brazing.
