The doubt that encounters when solder of hard alloy drill rod

The sex of drill rod solder of hard alloy is poorer. Because the volume containing carbon of hard alloy is higher,this is, contain a lot ofmore free carbon normally without the appearance that arrange, next the moisture that block up drill rod expects. In addition, hard alloy issues simple oxidation to make oxidation film in the temperature of drill rod solder, what also can affect drill rod to expect is damp. Consequently, it is very important that the appearance before drill rod solder arranges the damp sex that goes up in hard alloy to improving drill rod to expect, still can adopt the measure such as outside copper facing or plating nickel when necessary.
Another doubt in solder of hard alloy drill rod is contact easy happening crackle. Because its linear expansion coefficient is the half of mild steel only,this is, when the solder of matrix drill rod of hard alloy and this kind of steel, very great thermal stress can happen in contact, cause the craze of contact next. Consequently, when hard alloy and solder of different data drill rod, should try to adopt prevent crack method.
The appearance before solder of 2. drill rod is handled
The oxide that is necessary to eradicate workpiece appearance attentively before drill rod solder, grease, dirty content and paint, because fused drill rod expects cannot damp without the spare parts appearance that arrange, also cannot fill connect is interstitial. Sometimes, the corrosion resistance of the sex of drill rod solder that improves mother ability for the factory and connect of solder of ascensive drill rod, still be necessary before drill rod solder the spare parts beforehand plating Fu layer of some kind of metal.
(1) eradicate take out of smeary and smeary usable and organic dissolvent
Commonly used organic dissolvent has Xi of carbon of alcohol, 4 chloridize, benzine, 3 chloridize, 2 chloric ethane to reach 3 chloric ethane to wait. When batches small produce, can be 0 assorted dip in organic dissolvent clean and clean. In large quantities of producing, use the widest is defatted in the vapour of organic dissolvent. In addition, the cleanness in the alkaline solution in heat is attainable also contented effect. For example steeliness spare parts but immerge 70, in the solution of ten caustic soda of 80 ℃ defatted, copper and copper alloy spare parts can be in 50g phosphoric acid 3 natrium, 50g bicarbonate natrium adds the cleanness inside the solution of 1L water, solution temperature is 60 ～ 80 ° C. Of the spare parts defatted also can undertake in scour defatted hind with water attentive cleanness. When spare parts appearance can complete by water moisture when, indicate outside grease already take out is clean. To the small part with appearance is mixed and disorderly and very large amount, also can be in special slot child ultrasonic of be of use is clean. Ultrasonic goes oily efficiency is tall.
(2) eradicate oxide
Before drill rod solder, the oxide of spare parts appearance can use method of law of corrode of mechanical method, chemical dip and electrochemistry dip corrode to undertake. File, metal can use to brush when mechanical method arranges, sand paper, emery wheel, gush is arenaceous wait for take out 0 people: Outside oxidation film. Meantime file and sand paper are arranged use at sheet produce, the groove that when arranging, forms still is helpful for the moisture that drill rod expects and spread out. When batch produces, brush with emery wheel, metal, gush is arenaceous wait for method. The appearance of alloy of aluminium and aluminium alloy, titanium is unfavorable arrange a law with machinery.
(Metal of Fu of plating of appearance of 3) mother capable person
In metal of Fu of plating of appearance of mother capable person, its are main the purpose is the sex of drill rod solder that improves a few data, add drill rod makings to be opposite the damp ability of mother capable person; Prevent mother capable person and drill rod to expect quality of head of interaction butt joint produces undesirable effect, if prevent to produce crackle, cut down the compound between metal of interfacial happening brittleness; Regard drill rod as makings layer, install process and progress in order to simplify to give yield.

The article arranges storage-rack.onsonhardware.com of processing factory of drill rod solder