Abstract: In austenitic stainless steel welds, the grain structure is coarse and anisotropic. When ultrasonic beam propagate in such structure , following phenomena encounter :beam deviation, serious scattering , high attenuation. So if the conventional ultrasonic probes be used, it is difficult for detecting and sizing flaws in austenitic stainless steel welds because of low signal-to noise ratio. But broad bandwidth and narrow pulse Transmitter/Receiver side-by-side L waves probe (TRL probe) can overcome these difficulties. This article will introduce the benefits of TRL probe when it be used in austenitic stainless steel welds inspection. As a validation example, the  273 mm×30 mm austenitic stainless steel pipe weld is used in this article.