Different Metals Welding Issue? — Composite Welding Eliminates Thermal Expansion Stress

When combining dissimilar metals—such as carbon steel tubes and stainless-steel fins—thermal expansion differences can lead to cracking or delamination after repeated heating cycles. Traditional welding methods often fail to maintain structural integrity under high-temperature fatigue.

Zhongyue Metallurgy solves this issue using Composite Welding Technology, a proprietary process that precisely controls welding temperature and speed to balance internal stress between different metals. This method enables perfect metallurgical bonding between carbon steel base tubes and stainless-steel fins, whether they are H-type, wheel-type, or perforated L-type structures.

Fatigue tests under 1,000 high-temperature cycles confirmed zero cracking or separation. The technology is especially effective with materials such as 20G, 12Cr1MoVG, TP304, and TP316L, ensuring long-term bonding strength at operating temperatures up to 600°C.

Beyond mechanical stability, composite welding improves thermal conductivity, minimizes heat stress, and prevents long-term deformation. Combined with Zhongyue’s dual-layer corrosion protection system (external zinc phosphate coating + internal VCI inhibitor), these tubes deliver exceptional durability in corrosive or high-temperature environments.

This innovation makes Zhongyue’s H/L finned tubes the most reliable choice for power boilers, petrochemical exchangers, and marine waste heat recovery systems, delivering long-lasting performance and unmatched thermal efficiency.