Importance

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Abstract

In a heat exchanger tube, a brazing material, which is required for brazing tops (310) of inner fins (300) which are a flow passage dividing body and the inner surface of a tube body portion (200), not clad to a first material which constitutes the tube body portion but clad to a second material which constitutes the inner fins. In the heat exchanger tube, the tube has a thickness t.sub.tube of 1.2 mm or less and a width W.sub.tube of 16 mm or less, the first material has a thickness t.sub.1 of 0.25 mm or less, the second material has a thickness t.sub.2 of 0.10 mm or less, and the flow passages divided by the inner fins have an equivalent diameter of 0.559 mm or less. Besides, when brazing in a furnace, a brazing material disposed within the flow passages melts earlier than a brazing material which penetrates from outside into the flow passages, thereby preventing the flow passages from being clogged.

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First Claim