（
2
）
Clean the vehicle doors. Use fresh water or detergent to clean the dirt and greasy spots
on the door panels, and let them thoroughly dry for tests.
（3） Maintenance appraisal. Appraise the scope and degree of damage to the door panels by
testing and decide the maintenance methods.
（4） Clear the old paint. Before cleaning or maintenance, get rid of the old paint according to
the actual situation, especially when there exists obvious rust, cracks or dents; The paint
can be got rid of in manual, heating, mechanic or chemical metchod(s).
漆面
焊矩
铲刀
（5） Tests after the removal, including the measurements of the geometric dimensions
between various plate work pieces, tests of specific damage spots of various plate work
pieces, recognition of damage types, analyses of damage causes and choices of
maintenance schemes.
3. Main Contents of Door Panel Maintenance
Generally speaking, the causes of door panel damages are related to the following 4 aspects:
structure design defects, manufacturing defects, chemical erosion, and physical damage. And the
most common damage causes can be classified as the following types:
1
．
Abrasion: The surfaces of plate work pieces may contact each other and relative
movements will take place and cause surface friction, which will lead to abrasion. For example, the
long time friction between the hinge hole and the shaft of the vehicle door hinge will increase their
tolerance clearance and cause to vehicle doors to drop.
2． Erosion: This is generally due to the oxidation caused by the mud deposit and dirt; or the
rust caused by lack of anti-erosion processing after welding; or erosion caused by chemicals. This
type of damage usually occurs between the plate work pieces, in overlapped parts of spot-welded
pieces, and at other similar places.
Scraper
Painted
surface
Welding torch
To Next Page
Loading...
