Draper Storm Force® MMA Inverter Welder, 140A

Ultra-Compact, Portable Inverter Welding from the Draper Storm Force® Range

The Draper INV140A/SF is a 140A MMA inverter welder from Draper's Storm Force® range — engineered to deliver capable stick welding performance in one of the most compact, portable packages available. Weighing just 3.1kg and built into a hard case with a shoulder strap, this welder is designed for users who genuinely need to move their kit between jobs without it becoming a burden. Hot start and anti-stick technology come built in, helping to deliver reliable, smooth, and stable welds straight out of the case.

Genuinely Pocket-Sized Inverter Performance

The headline feature of the INV140A/SF is its remarkably compact size. At just 200 x 95 x 145mm and 3.1kg, this welder is small enough to carry comfortably with one hand or sling over a shoulder using the included strap. It fits easily into a tool bag, the back of a vehicle, or onto a shelf in a busy workshop — making it ideal for users who would otherwise be put off by the size and weight of larger welding machines.

Built-In Welding Aids for Easier Welds

The INV140A/SF is fitted with two key features that make a real difference to weld quality and ease of use:

Hot Start delivers a brief boost of current at the moment the arc strikes, helping the electrode ignite cleanly and consistently — particularly valuable on cold-start welds or when working with more demanding rods. Anti-Stick reduces current if the electrode does stick to the workpiece, helping to prevent it from glowing red and ruining the rod. Together, these features take much of the frustration out of stick welding — especially for less experienced users still building their technique.

20–140A Amperage Range

The welder offers a useful amperage range of 20–140A, giving you the flexibility to weld a broad spread of materials and thicknesses. The lower end of the range opens up thinner sheet work where heat control matters, while 140A at the top gives you the output needed for most general repair and fabrication tasks. The duty cycle is rated at 35% @ 140A and 100% @ 90A, making the welder well-suited to general-purpose stick welding tasks where short, controlled welds and reasonable rest cycles are the norm.

Standard 16A Plug Required — Easier Installation

Unlike higher-output welders that need a 32A supply, the INV140A/SF requires only a 16A plug (not supplied). This makes installation significantly more straightforward — a 16A circuit is much more widely available, easier to fit, and more practical for smaller workshops, home garages, and mobile work where access to a 32A supply may not always be guaranteed. Worth bearing in mind: the plug is not fitted as standard, so you'll need to add one as part of your setup.

Hard Case with Shoulder Strap

The welder is built into a hard case with an integrated shoulder strap, making it genuinely portable in a way that goes beyond just being light enough to lift. The shoulder strap lets you carry the welder hands-free — useful when you're also carrying a welding mask, electrodes, leads, or other kit between vehicle and worksite. The hard case construction protects the welder during transport and storage, supporting reliable performance over time.

Fan Cooling and Thermal Overload Protection

Active fan cooling helps the welder shed heat during use, supporting consistent performance across welding sessions. Thermal overload protection adds a further layer of reliability: if the internal temperature rises too high, the welder will protect itself automatically, helping to extend its working life and prevent damage from over-extended sessions.

Part of the Trusted Storm Force® Range

The INV140A/SF is part of Draper's Storm Force® range — a line dedicated to power tools and welding equipment built to perform reliably for the user who demands real working capability. Buying into Storm Force® means buying into a range built around delivering serious performance at a sensible price.

Key Features at a Glance

• 140A MMA inverter welder for stick welding
• Storm Force® range — Draper's performance-focused tier
• Amperage range: 20–140A
• Hot start for clean, consistent arc ignition
• Anti-stick to protect electrodes if they stick to the workpiece
• Ultra-lightweight at just 3.1kg
• Compact 200 x 95 x 145mm footprint
• Hard case with shoulder strap for genuine portability
• Fan cooled for reliable operation
• Thermal overload protection
• Duty cycle: 35% @ 140A / 100% @ 90A
• 230V power supply (16A plug required, not supplied)

Full Specification

Ideal Applications

The Draper INV140A/SF is a strong fit for general repair and light fabrication work, gate, fence, and garden metalwork, vehicle and trailer repair, occasional on-site welding tasks where size and weight matter most, hobby and DIY fabrication projects, and users setting up a first welder for home or workshop use. The combination of compact dimensions, 16A plug requirement, and a useful 20–140A range makes it especially attractive for users who want a capable welder that won't be a burden to store, move, or install.

Backed by the trusted Draper Tools name and Storm Force® range, the INV140A/SF brings genuine inverter performance, smart welding aids, and class-leading portability together in one ultra-compact package — a sensible choice for any user looking for a capable MMA welder that's easy to live with in every sense of the word.