Welding Office Chair Base

The welding process for office chair bases should be selected based on the specific scenario (repair or row-chair welding), with the core focus on controlling welding parameters and sequence to avoid deformation.

If repairing a broken office chair base, first assess the location of the fracture and the type of material. Common base materials include low-carbon steel or stainless steel. Before welding, clean oil stains and rust from the fracture surface to ensure the metal surface is clean. When welding, prioritize using a welding rod that matches the base material (e.g., J422 welding rod for low-carbon steel) and adopt a low-current, short-arc welding process to control heat input and avoid local overheating that could cause deformation. For load-bearing parts, segmented welding can be used in conjunction with hammering to eliminate stress. After welding, check the integrity of the weld and perform grinding if necessary.

If welding the metal frame of row-type office chairs, the process requirements are more stringent. Row-chair frames are typically made of steel tubes or plates, mostly from low-carbon steel or stainless steel. When welding, pay close attention to the following parameters:

1. Heat Input Control: Excessive heat input can result in excessive weld penetration, causing metal overheating and subsequent deformation upon cooling. Insufficient heat input can lead to inadequate fusion, potentially forming lack-of-fusion or porosity within the weld. Row-chair welding typically employs moderate heat input combined with a multi-pass welding process, controlling heat accumulation through layered welding to reduce deformation risk.
2. Weld Leg Size and Sequence: The weld leg size should be determined according to design requirements. Excessive size increases stress concentration, while insufficient size affects structural strength. It is recommended to weld symmetrically from the middle to both ends or use the skip-welding method (welding multiple points at intervals) to avoid heat concentration that could distort the frame. Some factories also perform overall heat treatment (e.g., low-temperature annealing) on row chairs after welding to eliminate residual stress and enhance structural stability.
3. Material Matching and Protection: If the frame is made of stainless steel, use a stainless steel-specific welding rod (e.g., A132) and control the welding environment humidity to avoid hydrogen-induced cracking. After welding, pickle and passivate the weld to prevent rusting.

Whether repairing or welding row chairs, safety operation is the top priority: wear protective goggles and gloves, ensure good ventilation to avoid inhaling welding fumes; after welding, inspect the weld quality and perform non-destructive testing (e.g., X-ray radiography) if necessary to ensure structural safety.