{"product_id":"spark-exhaust-o2-sensor-bung-m18-titanium","title":"Spark Exhaust O2 Sensor Bung M18 Titanium for Welding Universal SGATT328","description":"\u003cp\u003eA titanium bushing with an M18 × 1.5 thread, for welding into a titanium system. Twenty-four euro, and the only correct way to put a sensor into a titanium pipe.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWeld-in bung for a lambda sensor, M18 × 1.5 thread.\u003c\/li\u003e\n\u003cli\u003eTitanium.\u003c\/li\u003e\n\u003cli\u003eBody Ø 25 mm, underside milled to a Ø 54 mm pipe.\u003c\/li\u003e\n\u003cli\u003eSupplied for welding to the pipe.\u003c\/li\u003e\n\u003cli\u003eSpark part number SGATT328, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTitanium to Titanium\u003c\/h2\u003e\u003cp\u003eStainless and titanium cannot be welded to one another: the joint forms brittle intermetallic phases and cracks. A titanium system needs a titanium bung, which is the whole reason this article exists alongside the cheaper steel one.\u003c\/p\u003e\u003ch2\u003eThe Milled Underside\u003c\/h2\u003e\u003cp\u003eSpark machines the base of the bung to a Ø 54 mm radius, so on a 54 mm pipe it beds down along its whole rim with nothing to bridge. On a noticeably smaller or larger tube it touches at two points and rocks, and the weld then has to fill a crescent on either side — which is where porosity and cracks start. On another diameter, either dress the base back on a belt sander or accept a slower, more careful root pass.\u003c\/p\u003e\u003ch2\u003eWelding Titanium\u003c\/h2\u003e\u003cp\u003eGas shielding on both sides of the joint and a trailing shield over the cooling bead. A small part welded into a large pipe loses heat quickly, which tempts more current; more current without adequate shielding is exactly how a titanium weld goes grey and brittle.\u003c\/p\u003e\u003ch2\u003ePosition\u003c\/h2\u003e\u003cp\u003eThree tube diameters clear of a junction, in a straight section, tipped slightly upward so the sensor does not sit in condensation.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne per sensor position. SGATT139 is the same part in stainless steel — same thread, same Ø 25 mm body — for a steel system.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618387943690,"sku":"SGATT328","price":41400.0,"currency_code":"MWK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/629071dfe7e81_b94eb229-7e2c-4d0b-9e62-f78d4a6a8b78.png?v=1788354523","url":"https:\/\/inter-pace.com\/en-mw\/products\/spark-exhaust-o2-sensor-bung-m18-titanium","provider":"Inter-Pace","version":"1.0","type":"link"}