The brazing story:
In 1941, KI introduced its initial product, a steel folding chair, and today markets an extensive line of seating, tables and other furnishings. The company relies on brazing and Lucas-Milhaupt filler metals to ensure smooth, strong and invisible joints in their metal frame chairs.
Brazing is used in a variety of products at KI, and is a critical step in the manufacture of the company’s high volume, Versa brand chairs. The metal framed product line ranges from individual chairs with poly, wood or fabric seats to tandem seating units and children’s furniture.
Although the number of brazed joints per piece may vary, in most cases the joints are formed where the metal seat base and leg pieces come together. In all cases, like metals are joined, usually steel to steel. The brazing process takes place at an index station where multiple frames are joined simultaneously. An operator manually positions a ring or slug (SILVALOY® 505), in position on the frame parts. Flux is applied, and the parts are rapidly heated using gas-air torches. Once brazed, the finished frame is cooled using forced air and then water quenched to clean.
Why brazing? Brazing is the only choice when appearance and strength are critical. By brazing the metal frames on its Versa chairs, KI is ensured of not only strength and durability in its joints, but also a consistently smooth, clean and beautiful joint.
- KI relies on brazing to ensure appearance and strength in its Versa chairs.
- A technician positions the filler metal.
- Pre-heating of joints.
- Final heating station, where joints are completed.
- Water quenching helps to clean the brazed metal frames.