Are there any requirements for general automotive sheet metal welds?

2022-09-27 08:56:43

Although the welding seam, welding point and repaired steel plate surface of automobile sheet metal parts have been polished and cleaned, there are still numerous minimally invasive and irregular small bumps that are invisible to the naked eye, which are mixed with countless oxides, impurities, water vapor, etc. . Ordinary putty or anti-rust paint has anti-rust function, but it can only prevent the intrusion of external rust and play a temporary sealing role. As long as it is exposed to moisture and other harsh environments, defects will appear quickly. Such as epoxy primer can play an effective protective role.

Epoxy primer is suitable for smearing on the seams of panels or lap joint surfaces after welding, grinding, heating and quenching, etc. It is a good rust inhibitor. Generally, the feather edge of the paint film on the edge of the repair part (that is, the groove of the paint film) is prepared, and the epoxy primer is applied after cleaning the surface, which can ensure that the panel after various treatments can be used for a long time. No rust, even if there is rust originally, it will prevent the expansion of the rust range.

Metal sheets that are directly coated without special sheet metal sealing treatment will be eroded and uneven by various sundries, such as oil, coolant, sewage, etc. The vibration of the road surface causes deformation and cracking, and the anti-rust sealing line of the interface is broken, and the function is lost. It is an indispensable process to apply special sheet metal sealant to the meeting and other parts of the sheet.

Sheet metal sealant for automotive stamping parts is a non-corrosive polyurethane PU structural adhesive, which can fill, cover, bond and seal, and sometimes replace welding without damaging the paint. It has extremely strong adhesion, high strength after curing, strong and reliable, can enhance the strength of single-piece components and thin-shell body, and can maintain welding or lap joints, especially the inside and outside of wheel arches, chassis, trunk, and cockpit. Anti-corrosion function of the base plate and engine compartment.