Solder common sense: All sorts of soldering skill closes market

One, drill rod solder

Electric arc: A kind of intense and abiding gas discharge picture, sure voltage is being had between negative electrode, and the aeriform medium between two electrode should lie ionization state. Ignite solder when electric arc, it is normally two electrode (one very workpiece, another very fill tinsel or welding rod) receive electrify source, time weak point feels sharp departure, short circuit of the fit when each other feel arctic south, form electric arc. This kind of method calls feeling to bring arc. After electric arc is formed, want power source to hold to pole of north and south only between sure voltage, can maintain the burning of electric arc namely.

Electric arc characteristic: Electric depress, electric current big, temperature density of tall, energy is big, mobile the gender is good wait, general the stability that the voltage of 20 ～ 30V can maintain electric arc burns, and the electric current in electric arc can go to thousands of from a few with satisfaction different of workpiece solder requirement, the temperature of electric arc can amount to 5000K above, can fuse all sorts of metals.

Solder metallurgy process

In arc welding process, slaggy and liquid state metal, gentle style 3 person each other action, it is the process that the metal exercises again. But because solder conditional characteristic, solder chemical metallurgy process has again move and exercise the characteristic with different process commonly.

Principal, solder metallurgy temperature is high, phase boundary is big, resonant rate is rapid, when available gas is invaded in electric arc, the oxidation with meeting intense have a fit of anger, nitrogen melts liquid state metal resonant, still have rising of a lot of metals, and the moisture in air and workpiece and solder the oil that material guesses, rust, water decomposes the hydrogenous atom that go out below electric arc high temperature but dissolve enters liquid state metal in, bring about contact plasticity and toughness to reduce (hydrogen is fragile) , as a result produces crackle.

Next, solder bath is small, refrigeration is fast, make all sorts of metallurgy echo obtain balance condition hard, chemical composition is inhomogenous in welding line, and the gas in bath, oxide have not enough time to rise to, make the defect such as stomatic, slag inclusion simply, and even produce crackle.

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