DELTA-HEAT® as welding spatter protection
Avoid damage caused by sparks
Whether it is in manufacturing processes or in engineering: when pressure and heat result in small particles being emitted from welded surfaces, sparks are created. These can often be prevented by adapting the current or creating a protective atmosphere – but not always. These spatters are particularly troublesome when they adhere to the component. To avoid later problems in downstream processes such as insufficient coating and subsequent corrosion, the welding spatters are often removed manually. In these cases, high-quality coating solutions also offer a reliable solution.
Optimal welding spatter protection: DELTA-HEAT®
To avoid quality problems and costly reworking, the application of a special coating such as DELTA-HEAT® is advisable. This prevents the welding spatters from adhering to the substrate, thus ensuring a homogeneous surface. In the further process the DELTA-HEAT® can be painted over, for example with KTL. The removal of the applied layer for later coating processes can also be achieved without problem using a high-pressure cleaner and standard solvents, lyes or acids – for example acetone, 5% sodium hydroxide solution or 5% hydrochloric acid.
Tested welding procedures: MIG welding (left) and arc welding (right)
The illustrations show welded sheets, with the respective upper section (golden) untreated and the lower section (silver) coated with DELTA-HEAT®. The plates on the right have been cleaned.
A further benefit: DELTA-HEAT® reduces the scaling layer at the edge of the welding seam by up to 50 percent (see illustrations: right without coating, left with DELTA-HEAT®). The scaled area is also significantly reduced (see illustrations above).
DELTA-HEAT® 300: Cathodic corrosion protection at high temperatures
Whether it is exhaust and exhaust train components, brake components, heat shield or in the engine area: all cars contain parts and components that not only need to be protected against corrosion, but that are also exposed to high temperatures at the same time. Typically coated as bulk products, these components represent a particular challenge for corrosion protection coating, as key elements of the coating can lose their ability to function under the influence of heat, or no longer work reliably. Special coating solutions are therefore required here.
Heat and corrosion protection combined: DELTA-HEAT® 300
Although standard zinc flake systems or galvanic systems offer superb cathodic corrosion protection, they are not suitable for applications where they are subjected to very high temperatures. However, if a zinc flake is used as base coat – the DELTA-PROTEKT® KL 120 is particularly well-suited – with DELTA-HEAT® 300 as top coat, very good cathodic corrosion protection is achieved at temperatures of up to 600 °C. In addition, this high-performance system also satisfies further requirements typical of OEMs – for example good adhesiveness, coatability, chemical resistance and mechanical resistance with subsequent corrosion exposure.
This sheet was tempered at 500 °C for 30 minutes, subjected to stone impact (DIN EN ISO 20567) and exposed to 720 hours of salt spray testing (DIN EN ISO 9227). Result: no red rust is noticeable. The extremely resistant combination of DELTA-PROTEKT® KL 120 and DELTA-HEAT® 300 has already been included in MAN specification 183-3 B7.