company news about Weld metal and deposited metal

一、Definition

1. Deposited Metal
Deposited metal refers to the metal part formed on the welded piece after the welding material (such as electrodes, wires, etc.) melts during the welding process. It includes the metal formed after the welding material itself melts. For instance, in manual arc welding, the metal formed on the workpiece after the electrode melts is called the deposited metal.

The chemical composition and properties of the deposited metal depend on the composition of the welding material. For instance, when welding with stainless steel electrodes, the deposited metal will possess the properties of stainless steel, such as corrosion resistance.
2. Weld Metal
Weld metal refers to the metal part formed on the welded piece after welding, which includes the deposited metal and the part of the welded piece that melts during the welding process. That is to say, the weld metal is the metal formed by the melting and mixing of the deposited metal and the base metal of the weldment. For instance, when two steel plates are welded, the weld metal not only includes the deposited metal formed by the melting of the electrode but also the part of the steel plate edge that melts under the effect of welding heat.

二、Difference

1. Component differences

- Deposited metal: Its composition is mainly determined by the welding material. If the welding material is pure nickel electrode, then the main component of the deposited metal is nickel.

- Weld metal: Its composition is the result of the melting and mixing of deposited metal and the base metal of the weldment. For instance, when welding low-carbon steel and stainless steel, the composition of the weld metal will be a complex mixture of low-carbon steel and stainless steel as well as the welding materials.

2. Performance differences

- Deposited metal: Its performance mainly depends on the performance of the welding material. The deposited metal formed by using high-strength electrodes has a relatively high strength.

- Weld metal: Its properties are jointly influenced by the deposited metal and the base metal of the weldment. For instance, when welding steel of different strength grades, the strength of the weld metal will lie between that of the two types of steel and the deposited metal.

三、Application and Importance

1. Welding quality assessment

In the quality control of welding, the analysis of deposited metal and weld metal is of great significance. By analyzing the chemical composition and properties of the deposited metal, it is possible to assess whether the welding material meets the requirements. Analyzing the weld metal can determine the overall quality of the welded joint, such as strength, toughness and corrosion resistance, etc.

2. Selection of welding processes

According to the material of the weldment and the usage requirements, select the appropriate welding material to obtain the ideal performance of the deposited metal and weld metal. For instance, in Marine engineering, to ensure the corrosion resistance of welded joints, it is necessary to select welding materials that can form deposit metals and weld metals with good corrosion resistance.

Understanding the difference between weld metal and deposited metal is crucial for the correct selection of welding materials, control of welding quality and ensure the performance of the welded parts in use.