2 in 1 Spot and Seam Welder – Reliable DuoFlex 20K with Digital Microcomputer Controller

Why DuoFlex 20K for Sheet Metal Fabrication

In daily fabrication, two types of joining are most common:

• Spot Welding for quick tack joints and repeated weld points on lap joints

• Seam Welding for continuous joints where finish must look neat and joints must remain consistent along straight or curved edges

This 2 in 1 spot and seam welder is ideal for cabinets, enclosures, panels, HVAC ducts, frames, and production assemblies. Many workshops use separate systems for these tasks, which increases floor space, training time, and setup variation. DuoFlex 20K combines both processes into a single solution: a handheld single-sided spot welding gun plus a handheld roller seam welding option, powered by a 20 kVA thyristor-based DC system and controlled through a digital microcomputer controller for accurate settings and repeatable results.

To explore more solutions under resistance welding, browse the full category:
https://www.cruxweld.com/category/resistance-welding-equipments/

2-in-1 Welding System: Spot + Roller Seam

1) Handheld Single-Sided Spot Welding Gun (Quick Joining)

Spot welding is one of the most used joining methods for sheet metal jobs where speed and repeatability matter. The handheld single-sided spot gun in DuoFlex 20K is ideal for fast weld points in:

• sheet metal assemblies and panels

• steel cabinets and industrial enclosures

• stainless fabrication jobs and kitchenware components

• light frames, channels, brackets, and supports

• doors, wardrobes, and fabrication sub-assemblies

Because it is handheld, operators can position the gun directly on the joint area without moving or re-clamping heavy workpieces repeatedly. This is especially useful in job shops where products change daily and production fixtures need flexibility.

If your customer needs other spot welding formats and capacities, check our Spot Welder range:
https://www.cruxweld.com/category/resistance-welding-equipments/spot-welder/

2) Handheld Roller Seam Welding Option (Continuous Seam Output)

When a job requires a continuous seam line, a roller seam welding option becomes important. Roller seam welding is typically preferred when:

• you want a continuous joint rather than isolated points

• the product requires a cleaner visual finish

• the seam must remain consistent across batches

• your production line needs faster, uniform seam welding

• the joint path is straight or curved and needs controlled movement

The handheld roller seam option is useful for many sheet metal products where a continuous joint appearance improves the overall quality perception for the end buyer. It helps achieve consistent seam formation on repeated production runs when parameters are maintained correctly.

Optional 3rd Gun (Upgrade): Double-Sided Handheld Spot Welding Gun

Along with the standard 2-in-1 setup, DuoFlex 20K can be supplied with an optional double-sided handheld spot welding gun with upper and lower copper electrodes. This style is preferred when the customer can access both sides of the joint and wants a tong-type clamping action for stronger and more consistent spot weld points.

When the double-sided spot gun is recommended

• the joint can be accessed from both sides

• stronger, cleaner spot weld nuggets are required

• repeat production needs consistent pressure and alignment

• fixture-based welding is used for repeated parts

• the application demands stable clamping before current flow

Typical applications

• sheet metal lap joints with both-side access

• cabinet bodies, enclosures, frames, channels

• fabrication jigs and fixtures for repeated welding points

• ducting and light industrial production lines

A 2 in 1 spot and seam welder is ideal for cabinets, enclosures, panels, ducts, frames, and other sheet metal assemblies. This optional accessory is a strong choice for customers who want consistent spot welding output across operators and batches, especially where pressure and electrode alignment must remain stable.

Digital Microcomputer Controller: Accuracy, Repeatability, and Memory

Buyers prefer a 2 in 1 spot and seam welder to reduce floor space, simplify operation, and maintain repeatable weld quality with stored programs. In resistance welding, most inconsistent quality comes from variation in timing and operator settings. DuoFlex 20K includes a digital microcomputer controller that supports accurate adjustment and repeatable welding cycles. It helps maintain consistent output by allowing the operator to set key parameters and store multiple welding programs for repeated jobs.

Key adjustable controls used in fabrication

• Weld time – controls how long current flows through the joint

• Squeeze time – controls clamping time before welding begins

• Pre/Post timing – helps stabilize the cycle and repeatability

• Weld current/heat control – adjusted based on thickness and joint design

Once suitable settings are finalized for a job, the memory feature helps repeat the same output without daily re-tuning. This reduces setup time, avoids inconsistency between operators, and supports batch production.

Welding Modes: Continuous and Pulsed

DuoFlex 20K supports continuous and pulsed welding modes. These modes help manage different job conditions, especially when sheet thickness varies or controlled heat input is required.

• Continuous mode is commonly used for standard spot welding cycles and seam welding where stable output is required.

• Pulsed mode is helpful when controlled heat input is needed to reduce overheating on thinner sheets or sensitive joints.

In practical fabrication, pulsed mode helps control marking and heat distortion on thin sheet applications, while continuous mode is the preferred choice for regular production.

Where DuoFlex 20K Fits Best (Industries + Job Types)

DuoFlex 20K is designed for job shops and production environments where sheet metal welding is regular and both spot and seam capability is required in a compact setup.

Common buyers

• sheet metal fabrication shops

• electrical panel and enclosure manufacturers

• HVAC and ducting fabricators

• stainless fabrication workshops

• cabinet, furniture frame, and light structure makers

• maintenance and repair teams requiring portable handling

Typical jobs and products

• enclosures and cabinets

• ducting components

• light frames and brackets

• channels and supports

• stainless assemblies

• curved seam products where seam roller is useful

• repeated spot joints in fixtures and production assemblies

Power System: Thyristor-Based DC Resistance Welding

DuoFlex 20K uses a thyristor-based DC power source designed for stable resistance welding performance. Stability supports:

• consistent weld nugget formation

• repeatable output between weld points

• reduced variability across operators

• smoother production cycles

When combined with digital timing control and program memory, the output becomes more predictable for daily fabrication work.

Export-Worthy Wooden Packing (Worldwide Safe Dispatch)

For export orders and long-distance shipments, DuoFlex 20K can be dispatched in a strong export-grade wooden crate designed to protect the machine from impact, vibration, and handling shocks during transit.

Packing highlights

• heavy-duty wooden crate protection

• suitable for domestic and international shipments

• helps reduce transit damage risk

• recommended for sea and air freight movement

For pricing, delivery timeline, optional double-sided spot gun availability, and export wooden packing, contact us here:
https://www.cruxweld.com/contact-us/

For a general overview of resistance spot and seam welding, you can refer to the American Welding Society (AWS):
https://www.aws.org/