What Are The Basic Steps Of The Welding Process?

The welding process of Qingdao Longchang Jie Machinery Co., Ltd. has a clear procedural framework, and each step of the operation plays a crucial role in the final welding quality. The core process mainly consists of the following parts:

1. Preparation Work

- Workpiece preparation (joint preparation):

- Cleaning: We must thoroughly remove impurities such as oil, rust, etc. in the welding area and within 20-30mm on both sides. These impurities are particularly prone to cause porosity and slag inclusion problems. Common methods include steel wire brush grinding, sand wheel grinding, solvent cleaning, etc.

- Groove processing: For thicker plates (usually > 6mm) or weld seams that require penetration, we need to process specific shapes such as V-shaped or X-shaped grooves at the joint edge. This is to ensure penetration, reduce welding deformation, and save welding materials. We usually use flame cutting, plasma cutting, etc. to process.

- Assembly/fitting and spot welding: We need to precisely assemble the welding components according to the drawing requirements, fix them with fixtures, positioning blocks, etc., to prevent welding deformation. Then, do spot welding at the key positions of the joint, use short temporary welds to fix the components firmly, and the spot welding should use the same materials and processes as the formal welding.

- Preheating before welding: For thick plates, high-carbon steel materials that are prone to cold cracking, or when the ambient temperature is low, we should heat the workpiece to 100°C - 400°C as a whole or locally. We can use flame heating, electric heating blankets, etc.

2.Conducting Welding

For example, in tungsten inert gas welding, non-contact arc ignition is used.

- Welding operation: The welder needs to stabilize the control of the welding gun's angle, height, and welding speed. Maintain an appropriate arc length. An excessively long arc may lead to poor protection, while an excessively short one is prone to wire sticking. The welding speed should be uniform; too fast or too slow will affect the welding quality.

3.. Post-Welding Treatment

- Remove welding slag and spatter: After the weld cools, use tools such as a slag hammer and steel wire brush to remove the welding slag and spatter from the surface and surrounding areas.

- Adjust the appearance: If the weld height is too high or there are defects, grinding can be performed, but be sure not to damage the base material.