Aluminium reachs the solder aftertreatment of aluminium alloy

1, eradicate residual
After weldment solder is over, if be to apply gas welding or solder of coating welding rod, undertaking to welding line the exterior is examined before be being checked with nondestructive, demand reachs the remaining flux of both sides and solder broken bits to undertake in time eradicating to welding line, corrode welding line and its appearance in order to prevent solder broken bits and remaining welding flux, prevent to make undesirable consequence. Method arranges to be as follows after commonly used solder:
1) in 60 ℃ - the scrub in the hot water of 80 ℃ ;
2) put heavy chromic acerbity Potassium (K2Cr2O2) or the chromic anhydride that quality mark is 2%-3% (Cr2O2) ;
3) be in again 60 ℃ - the rinse in the hot water of 80 ℃ ;
4) the drying in putting sweatbox or airing.
To check the effect of remaining flux take out, can go up in the drop in the welding line of weldment distilled water, rise distilled water collect again next, drip to contain in the small tube of the nitric acid solution of 5% , if have white deposit, show remaining flux had be notted eradicate complete.

2, the outside processing of weldment
The course solders appropriately technology and correct operation skill, the aluminium after soldering and aluminium alloy welding line are outside, have even moire and smooth appearance. Positive pole changes processing, especially when polishing and coloring skill collaboration are applied, can acquire high quality decorate appearance. Reduce solder hot influence area, can apply in relief poling to cause undesirable color change to decrease to the smallest. Apply solder quickly technology, but utmost ground is cut down solder hot influence area. Light is consequently right the welding line of solder, quality of in relief poling is crackajack.

Fall to anneal condition especially cannot the weldment of the alloy of heat treatment aggrandizement, after in relief poling, the metal is mixed at all solder the colour contrast between hot influence area is the smallest. Furnace counteracts solder of macerate drill rod is not local heating, so metallic colorific exterior is very even. But the alloy of heat treatment aggrandizement, often use as building construction part, they are soldering henceforth, often undertake in relief poling. In this kind of alloy, solder heat the component that can make alloying element goes out, in relief poling henceforth, heat can present distinction between influence area and welding line. These haloing in weld zone vicinity, apply solder quickly can make its are decreased to the smallest, apply cooling space block and pressing plate to also can make haloing is decreased probably very small, after these haloing are soldering, before in relief poling, undertake originallying falling handling can be eliminationed.

In the weldment of chemical processing, can encounter welding line sometimes metal and base the colour of complete metal is different bigger, this is necessary the part that he picks fill metal finely, when silicon is being contained in alloy composition especially, can deserve to compare to colorific influential.
If be necessary,can undertake mechanical polish to solder. Commonly used mechanical polish has polishing, burnish, abrasive gush is attacked, gush bolus. Mechanical polish is passed namely abrade, go burr, roll light, the physical method such as polishing or arenaceous light improves the appearance of aluminous workpiece. Its purpose is a course as far as possible the outside quality that little working procedure acquires a demand. But, aluminium and aluminium alloy belong to soft metal, coefficient of friction is taller, and if break out,be in in abrade process overheat, make weldment is out of shape likely, base the phenomenon to craze of Cong Jing bound. This request has in polishing process abundant smooth, outside to the metal pressure should lower minimum.

3, the heat treatment after solder
The purpose of the heat treatment after solder is to improve namely solder the organization of contact and function or eliminate remaining stress.
But aluminium alloy of heat treatment aggrandizement is soldering henceforth, can have heat treatment from the beginning, the intensity that makes base metal heats up influence area recovers to get close to original intensity. Normally the circumstance falls, contact broken harm is to be inside the fused area of welding line normally. After the heat treatment after undertaking solder from the beginning, the strength that place of welding line metal gains, principal depend on the fill metal that makes come loose. The composition of fill metal and base metal is differ case, intensity will depend on fill metal is spent to the dilute of base metal. First-rate intensity and solder the heat treatment photograph that metallic place uses suits.

4, the repair of the plastics of welding line and welding line blemish
A commodity solders after ending, be necessary to try about the welding line of undermentioned appearance blemish plastic:
1) big connect, be opposite namely draft, wide all a lot of out of tolerance are very pie-eyed;
2) anything superfluous or useless. Anything superfluous or useless is overmuch melt metal, mechanical heart piles up together, do not have fusion with lumber, not be the component of welding line, be necessary to be shovelled;
3) intermittent the solder tumor that the arc since solder manages. Plastic stuff is the shovel stick that chooses all sorts of figure normally, the appearance after making repair and excellent welding line are essential and common, cannot make when repair mother capable person produces nick or knife wound.

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