Container House Welding Process

The welding process for container houses mainly includes steel structure frame welding, side panel and base panel welding, and sealing welding. It is necessary to select appropriate welding methods and equipment based on material characteristics and strictly control process parameters to ensure quality.

1. Steel Structure Frame Welding

The framework of a container house is composed of steel materials such as channel steel and square tubes, which need to be welded to form a stable structure. Base and top frame welding is a core step. Usually, CNC plasma cutting and fully automatic welding processes are used to ensure that the flatness error of the top and base frames is controlled within ±2mm, preventing misalignment or water leakage during hoisting and assembly. Column welding requires the use of professional equipment for shaping, with a thickness of no less than 1mm. Together with the channel steel, they support the house structure and determine its overall strength.

2. Side Panel and Base Panel Welding

The welding of side panels and base panels requires the selection of processes based on material characteristics:

• Steel Containers: Carbon dioxide gas shielded welding or pulsed argon arc welding are commonly used. The former is suitable for rapid welding of carbon steel with a penetration depth of 3-5mm; the latter is used for precision welding of stainless steel, with a small heat-affected zone to prevent intergranular corrosion.
• Aluminum Alloy Containers: Due to their poor weldability, the Megmeet Artsen II PM500F welder is required, along with direct current short-circuit processes and specialized machine welding to solve issues such as unstable arcs and excessive spatter.
• Special Processes: For example, in the sealing welding of energy storage containers, robotic systems are used to achieve continuous welds, combined with helium leak detection processes (leak rate ≤ 10⁻⁹ mbar·L/s) to ensure a protection level of IP55 or higher.

3. Sealing and Detail Welding

Sealing welding focuses on treating weak points such as door seams and lock holes to prevent the intrusion of rainwater and dust. For example, the Coolstic container protective door uses gas shielded welding, with intermittent spot welding between the internal reinforcing ribs and the panel of the door leaf and continuous full welding at the four corners. The hinge and lock areas are reinforced with thickened backing plates and fully welded. After welding, the welds need to be ground, spatter removed, and corrected and shaped to ensure that the flatness and diagonal dimensions of the door meet standards.

4. Automation and Quality Control

Modern container welding widely adopts automation technologies, such as robotic welding fixtures, which can reduce human deviations and improve efficiency and quality. At the same time, the welding station data (such as current, voltage, and time) is monitored through an IoT platform, and parameters are adjusted in real-time to ensure proper fusion at the arc start and full penetration at the arc end of the welds, controlling heat input and spatter. In addition, after welding is completed, visual flaw detection inspections are required to confirm the absence of defects such as pores, slag inclusions, and cracks.