Chery QQ, Руководство по обслуживанию

Страница: 527 / 635

Chery QQ Service Manual Body System
to take the small weld nugget as positioned weld according to interspaces of 30mm-50mm, carry
out welding in order after knocking ,make the surface to be flattened. In the case of welded seam
which needs high intensity, it is better for you to adopt two sided welding mothod.
(7) Flatten the welded seam with flat hammer, eliminate the welding pressure, then shaping it,
and polish the welded seam with rotary sander.
2.2.4 Recovery of fold
Fold includes “live folding”and“dead folding”according to damage degree of sheet metal pieces,
“live folding” means the slight fold which is can be eliminated directly by knocking the
protruding with hammer. “dead folding”refers to the serious folded part which squeeze together
tightly, two edges of the fold will become more and more “dead”, even cannot be relaxed if you
directly knock the protruding with hammer, therefore it is called “dead folding”.In principle,
recovery of fold is to open the “dead fold” first, make it unfolded gradually ,and make it become
“living fold”, then change the“live folding”to rough and uneven in surface, recover the rough and
uneven ones accordingly. The repair procedures are introduced as follows:
(1)Put the straightening force opposite to percussive force on the folded place adopting unfolding
method, make the fold unfolded, make the fold relaxed.
(2) Dismantle the damage parts and put it on the surface plate, begin from inside of the fold, you
can use suitable tools for prizing it open, heating with welding blow lamp while prizing it open,
turn the “dead fold” to “living fold”.
(3) Flatten the “living fold” from inside fold area with hammer. The knocking point shall be put
on the most protruding place. At the same time, it is necessary for you to make the surface plate
to play the role of mat while knocking. After it is ok, you can rotate the parts to knock the other
side until the folded parts are unfolded totally.
(4) Make it recover basically by means of heating and knocking while measuring with the
sample.
(5) After installing the finished parts in the vehicle body, you can check it according to the
sample; you can make further and finer straightening work in order to make it achieve the goal
eventually.
(6)You can adopt digging recovery method if it is impossible for you to repair the serious folded
damage in local position of sheet metal parts.
2.3 Welding of four doors and two lids
The following welding methods can be applicable to door welding: oxygen acetylene weld 、
CO2 blocking welding 、 hand work arc welding 、 resistance spot welding 、 brazing .Furthermore,
in order to not make the vehicle lower its own strength and durability, you’d better adopt the
same welding method as original maker’s as possible as you can, size and type of all welding
sockets shall be similar to the original maker’s.
In the case of appearance quality, defects such as burn-through, half point,fissure and large
amounts of fins for weld nugget shall be prohibited, surface of weld nugget shall be smooth and
good-looking, obvious twisted deformation shall not be allowed, depth of press mark shall be
- 16-
Chery Automobile Co., Ltd