Weld End Exhaust Bellows

Weld-end exhaust bellows are flexible metal components used to connect exhaust pipe sections while reducing piping stress caused by thermal expansion, mechanical vibration, and limited axial movement. A standard assembly consists of a formed stainless steel bellows with straight pipe ends that can be welded directly into engine, generator, marine, and industrial equipment exhaust systems.

Yueding manufactures weld-end exhaust bellows for bulk orders and customized exhaust system projects. Pipe diameter, overall length, end-pipe dimensions, material grade, and single- or multi-ply bellows construction can be customized from drawings, samples, and confirmed operating conditions. Optional configurations include internal liners and external protective sleeves. We support drawing review, rapid sample development, and OEM/ODM production with competitive pricing. Provide the required dimensions, installation position, and operating conditions so that we can confirm a suitable specification.

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Product Description

Specifications	Diameter (DN)	Axial Compensation (mm)	Axial Stiffness (N/mm)	Maximum Radial Size (mm)	Interface Dimension (D × d, mm)	Product Length L (mm)	Pressure Range (MPa)
TB100 × □-□	DN100	13–54	1323–115	238	Ø108 × 4	280–380	0.25–2.5
TB150 × □-□	DN150	15–67	1910–158	289	Ø159 × 4.5	280–380	0.25–2.5
TB200 × □-□	DN200	30–101	1493–106	389	Ø219 × 6	380–520	0.25–2.5
TB250 × □-□	DN250	30–124	1850–126	443	Ø273 × 8	380–520	0.25–2.5
TB300 × □-□	DN300	34–111	2945–110	495	Ø325 × 8	400–600	0.25–2.5
TB350 × □-□	DN350	33–117	3229–119	577	Ø377 × 8	400–600	0.25–2.5
TB400 × □-□	DN400	36–122	3690–131	626	Ø426 × 8	400–600	0.25–2.5
TB450 × □-□	DN450	38–125	4145–145	678	Ø478 × 8	400–600	0.25–2.5
TB500 × □-□	DN500	31–125	4600–160	729	Ø529 × 8	400–600	0.25–2.5
TB600 × □-□	DN600	53–156	2908–135	830	Ø630 × 10	560–850	0.25–2.5
TB700 × □-□	DN700	50–158	2656–145	980	Ø720 × 10	560–850	0.25–2.5
TB800 × □-□	DN800	50–159	2924–155	1080	Ø820 × 10	560–850	0.25–2.5
TB900 × □-□	DN900	50–164	3205–167	1180	Ø920 × 10	560–850	0.25–2.5
TB1000 × □-□	DN1000	50–163	4104–184	1280	Ø1020 × 10	560–850	0.25–2.5
TB1100 × □-□	DN1100	32–116	4473–263	1380	Ø1120 × 10	680–800	0.25–1.6
TB1200 × □-□	DN1200	32–116	4843–283	1480	Ø1220 × 14	680–800	0.25–1.6
TB1300 × □-□	DN1300	31–113	5215–303	1580	Ø1320 × 14	680–800	0.25–1.6
TB1400 × □-□	DN1400	31–111	5587–323	1680	Ø1420 × 14	680–800	0.25–1.6
TB1500 × □-□	DN1500	31–116	5961–343	1780	Ø1520 × 14	680–800	0.25–1.6
TB1600 × □-□	DN1600	33–113	6242–363	1880	Ø1620 × 14	680–800	0.25–1.0
TB1700 × □-□	DN1700	33–107	6611–383	1980	Ø1720 × 14	700–820	0.25–1.0
TB1800 × □-□	DN1800	33–106	6981–403	2080	Ø1820 × 14	700–820	0.25–1.0
TB1900 × □-□	DN1900	33–106	7351–423	2180	Ø1920 × 14	700–820	0.25–1.0
TB2000 × □-□	DN2000	36–88	5721–708	2360	Ø2020 × 14	725–800	0.25–1.0

Note: The above parameters are for reference only. The stated fatigue life is 1,000 cycles. Other specifications can be designed and calculated separately. The primary displacement direction is axial, with a limited amount of lateral and angular displacement.

Manage Thermal Movement and Vibration

The formed bellows section gives your exhaust line the flexibility needed to accommodate limited axial movement and reduce the transfer of mechanical vibration. This helps protect adjoining pipes, welded joints, and connected equipment from repeated stress during temperature changes and equipment operation.

Instead of forcing rigid pipe sections to absorb all movement, the bellows provides a controlled flexible area within the exhaust assembly. The required compensation range should be matched to the actual diameter, number of convolutions, ply construction, operating pressure, temperature, and expected movement.

Direct Weld-End Integration

Straight pipe ends allow you to weld the bellows assembly directly into the exhaust line without adding separate flanges, gaskets, or multiple fasteners. The compact structure takes up less installation space and reduces the number of connection parts that need to be matched during assembly.

By confirming the end-pipe OD, wall thickness, length, and edge preparation in advance, you can achieve a cleaner fit with the adjoining pipe and reduce additional cutting, expanding, or adjustment during installation. Proper alignment and welding also help maintain stable sealing and load distribution at the joint.

Bellows Construction Matched to Your Application

You can select a single- or multi-ply bellows according to the pressure, temperature, required movement, and flexibility of the exhaust system. A single-ply structure provides a straightforward construction, while a properly designed multi-ply bellows can offer lower spring stiffness and greater flexibility under comparable total wall thickness and convolution geometry.

An internal liner can be added where the flow path requires guidance or where the bellows should be separated from direct gas impact. An external protective sleeve can help shield the corrugated section from impact and handling damage. Selecting the appropriate structure from the beginning helps you maintain consistent fitment and performance when the same specification is used again.

Customization Options

Material Selection: Parameter Introduction

Material

Temperature (°C)

Characteristic

Heat resistance

Durability

Corrosive

Comparison diagram of single-layer and double-layer corrugated pipes

Single-layer vs. Double-layer Bellows

Multi-layer Bellows Cross-section

The wave height, wall thickness, and number of layers decide how a metal bellow works. A higher wave gives more flexibility and movement, but the pressure resistance becomes lower. A thicker wall can take more pressure but makes the bellow harder to move. We usually choose the structure based on your working condition.

Single-layer bellows are light and flexible. Multi-layer types are stronger and last longer, but they are heavier and cost more. They are used in systems with high temperature, vibration, or pressure changes.

YDCT can produce bellows by hydraulic forming, roll forming, or edge welding. Each method fits different sizes and applications. Hydraulic and roll forming are common for exhaust or industrial use, while edge-welded bellows are used for vacuum or precision equipment.

Ends can be made with flanges, threaded fittings, or welded pipes. YDCT can also follow your drawings or samples. The temperature and pressure range depends on material and layer number.

Our factory makes bellows for automotive exhaust, industrial machinery, HVAC, and other systems. The products are made under ISO 9001 quality control and designed for long working life without leakage or pollution.