Welding Methods for Container Houses
The welding of container houses primarily employs carbon dioxide gas shielded welders, inverter DC manual arc welders, DC pulsed argon arc welders, and medium-frequency resistance spot/seam welders, with specific application scenarios and parameters as follows:
1. Carbon Dioxide Gas Shielded Welder (CO₂ Welder)
Container wall panels are mostly made of 1.5~2.5mm thick Q235/Q355 low-carbon corrugated thin steel plates, with welds mainly consisting of longitudinal lap joints and corner joints with the frame. The CO₂ welder achieves moderate heat input through short-circuiting transfer, allowing single-pass welding to meet the fusion requirements of thin steel plates, with significantly less welding deformation compared to manual arc welding, making it suitable for mass production on assembly lines.
- Assembly Line Automatic Welding: Utilizes a gantry multi-axis CO₂ automatic welder, paired with φ1.0
1.2mm solid carbon steel welding wire, with a welding current of 120160A, voltage of 1822V, and a welding speed of 0.81.5m/min. - Manual Repair Welding: Uses a portable inverter CO₂ welder with the same welding wire specifications as automatic welding, with a welding current of 120
180A and voltage of 1822V, suitable for local repairs or non-standard welds.
2. Inverter DC Manual Arc Welder
Used exclusively for corner repairs on container wall panels and non-standard lap weld operations (such as temporary repair welding between wall panels and the base frame). Paired with φ2.5mm J422 carbon steel electrodes, the welding current is controlled between 80~120A, with strict control over single welding times to prevent burn-through or excessive deformation of the thin steel plates. This process offers high flexibility but low efficiency, suitable for small-scale repair scenarios.
3. DC Pulsed Argon Arc Welder (TIG Welder)
Primarily used for seamless welding of color-coated steel wall panels and precision welding of stainless steel-lined wall panels, preventing damage to the coating or oxidation and discoloration of the weld. It employs a direct current positive connection mode, with a welding current of 80150A, pulse frequency of 50200Hz, and argon flow rate of 8~12L/min. Before welding, the surface of the plates must be thoroughly cleaned of oil and rust to prevent porosity defects, suitable for scenarios with high requirements for weld appearance and corrosion resistance.
4. Medium-Frequency Resistance Spot/Seam Welder
Used for temporary positioning welds between wall panels and the base frame and rapid spot welding of wall panel joints, without the need for filler wire. It achieves local fusion through resistance heat, offering high welding efficiency and minimal deformation, but is only suitable for temporary fixation or non-load-bearing structural connections, requiring subsequent completion of permanent welding through other processes.
Summary: The selection of welding processes for container houses requires comprehensive consideration of plate material, thickness, weld type, and production efficiency. CO₂ welders are the mainstream process, covering most structural welding; manual arc welders are used for repairs; argon arc welders ensure precision weld quality; and resistance spot welders serve temporary positioning, with each process working together to meet diverse needs.
