There are many details in the installation and welding of Marble Sculpting, which the welding master must remember when welding.
1. Clean the joints to prevent the welding rod from being stained with oil and other dirt, so as not to increase the carbon content of the weld and affect the welding quality.
2.
stone sculpture should be kept dry during use. In order to prevent cracks, pits, pores and other defects, the titanium-calcium coating should be dried at 150-250 for 1 hour before welding, and the low-hydrogen coating should be dried at 200-300 for 1 hour before welding. Do not repeat drying multiple times, otherwise the coating will easily fall off
3. stone sculpture are usually titanium calcium type and low hydrogen type. Try to use DC power supply for welding current, which is helpful to overcome redness and melting depth. Calcium titanium coated electrodes are not suitable for welding in all positions, only suitable for flat welding and fillet welding; those coated with low hydrogen can be welded in all positions.
4. The welding current should not be too large, but it should generally be about 20% lower than that of carbon steel electrodes. The arc should not be too long and the interlayer should be cooled quickly. Narrow welding is appropriate.
5. The arc ignition is very detailed and the arc ignition page cannot be designed in non-welding parts. The arc is struck with an arc striking plate made of the same material as the weldment.
6. Short arc welding should be used as much as possible. The arc length is generally 2-3 mm. If the arc is too long, it will easily cause thermal cracks.
7. When welding dissimilar steels, welding rods should be carefully selected to prevent thermal cracks caused by improper selection of welding rods or phase precipitation after high-temperature heat treatment, which will cause the metal to embrittle. Reference should be made to
stone carving and dissimilar steel selection criteria, and appropriate welding techniques should be used.
8. Strip transportation: Short arc fast welding should be used, and lateral swinging is generally not allowed to reduce heat and the width of the heat-affected zone, improve the resistance of the weld to intergranular corrosion, and reduce the tendency of hot cracks.
