There are many aspects that require special attention during the entire process of welding for Marble Sculpting. Marble Sculpting manufacturers talk about what aspects should be paid special attention to during Marble Sculpting and welding operations.
1. Generally speaking, there are two types of
stone carving electrodes: calcium titanium type and low hydrogen type. Calcium-titanium welding core wire is only suitable for flat welding and fillet welding, and is not suitable for all-position electric welding. Try to use a DC regulated power supply for the current during electric welding, which is beneficial to eliminating the redness and melting density of the welding wire.
2. In order to avoid cracks, pits, vents and other problems, calcium titanium core welding should be dried at 150-250℃ for 1 hour, and low hydrogen core welding should be dried at 200-300℃ for 1 hour.
3. Keep the welds clean and tidy, and avoid oil and dirt on the welding wire to avoid increasing the welding carbon content and affecting the welding quality.
4. In order to avoid stress corrosion caused by heating, the electric welding current should not be too large, which is usually about 20% lower than that of stone carving electrodes. The arc should not be too long. The virtual beam cools quickly, so narrow lane welding is suitable.
5. When striking the arc, please note that the arc cannot be struck in the non-electric welding position. An arc striking plate made of the same material as the welding piece is used to strike the arc.
6. Try to use short arc electric welding. If the arc is too long, it will easily cause thermal cracks. The chord length is generally 2-2mm.
7. Short arc rapid welding should be used for transporting the strips, and sideways movement is generally not allowed. The purpose is to reduce the heat generation and the width of the thermal hazard zone, improve the welding resistance to stress corrosion, and reduce the tendency of thermal cracks.
8. Welding rods should be used with caution when welding different steels to prevent thermal cracks caused by improper use or phase dissolution caused by high-temperature quenching and tempering heat treatment, making the metal brittle. Refer to the selection standards for welding rods for stone carving plates and different steels, and adopt appropriate welding methods.
