The study examines factors influencing the weldability of SKD 11 grade steel used in mold manufacturing through the Gas Tungsten Arc Welding (GTAW) process.

Abstract

The objective of this research study was to study the factors that influence the weldability of the steel used to produce molds. SKD 11 grade with TIG  welding process (GTAW) Let's start by defining the welding conditions. Welding current, Number of layers of welds, Deposited rate, and heating temperature before and after welding. The welding specimen is then examined for cracks and tested for mechanical properties. Experiments have shown that 3-layer weld welding, full-notch welding, and low heat intake. As a result, the hot impact area is narrower than in full single-layer welding. And welding with a welding current of 105 amps, making the filling wire and melting metal go well together. Lack of inter-run fusion was not detected, but the surface of the weld was found to be concave, and 25 percent of the weld length was found. By increasing the feed rate from filling 1 wire at a time to 2 wires at a time, the measurement with the gauge showed that the weld surface bulge increased, and from the examination with the penetrator solution, no cracks were found on the weld surface. [1] Pre-heating at 300 degrees Celsius and post-heating at 300 degrees Celsius are the same. It has a high hardness of 50 HRC and an impact capacity of 2.5 joules (J), but if the heating temperature after welding is increased to 700–900 degrees Celsius, it is found that it can withstand more impact, but the hardness value will decrease, which is not suitable for mold making. In conclusion, SKD 11 steel has a low weld ability, so attention should be paid to determining important variables in welding. To avoid residual stress until it causes cracking after welding is completed.