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Capacitor Discharge (CD) Stud Welder - CDi 1502 AT

The CDi 1502 AT is a high-performance inverter-capacitor Capacitor Discharge (CD) stud welder engineered for high-speed production and thin-gauge sheet metal applications. Supporting production rates of up to 40 studs per minute on 0.012” (M3) studs, it welds mild steel, stainless steel, aluminum, and brass studs from #4 to 5/16" (M3 to M8). The optional automation package allows the system to operate with a semi-automatic PAH-1 welding gun and a VBZ-3 automatic stud feeder, making it suitable for semi-automatic production workstations. Get the CDi 1502 from Sunbelt Stud Welding, Houston, TX, supplied throughout the United States.

Capacitor Discharge (CD) Stud Welder - CDi 1502 AT

Description

Unbeatable new power pack

  • With efficient inverter-capacitor charging technology
  • Enormous time and energy savings (30% less energy)
  • Highest cycle sequence of its class (up to 40 studs/min.)
  • 20% energy reserve due to 220 V charging voltage
  • Simple operation & minimal weight (20% lighter than previous model)
  • Extreme long life due to robust and functional industrial design

Highest level of quality and safety

  • Capacitor formation recorded - Quality control for consistent capacitor quality through automated formation
  • Shock-proof capacitor battery - No contact of the capacitors to the device housing; sparkover (short circuit) is therefore not possible
  • Cooling channel - Protects the electronic components from getting soiled. Ideal cooling of the inverter charging p.c. board for high sequence cycles.

Application

Especially suitable for high-cycle stud welding for thin gauge base material.

Performance Features

  • Unbeatable new power pack
  • With efficient inverter-capacitor charging technology
  • Enormous time and energy savings (30% less energy)
  • Highest cycle sequence of its class (up to 40 studs/min.)
  • 20% energy reserve due to 220 V charging voltage
  • Simple operation & minimal weight (20% lighter than previous model)
  • Extremely long life due to robust and functional industrial design
  • Automated capacitor formation monitoring
  • Shock-proof capacitor battery
Mild steel
Stainless steel
Aluminium
Brass
M3 to M8 - #4 to 5/16"
GENERAL INFORMATION
Application
  • Mild Steel, Stainless Steel, Brass, Aluminium
  • M3 to M8 - #4 to 5/16"
TECHNICAL SPECIFICATIONS
Welding Process CD
Welding Material Mild steel, Stainless steel, Aluminum, Brass
Technology Inverter-Capacitor Charging Technology
Equipment Automation
Display Digital
Welding range M3 to M8, dia. 2 to 8 mm / #4 to 5/16" , dia. 14 ga to 5/16"
Cupped head pins: dia. 2 and 2.7 mm / 14 ga and 12 ga
Insulation pins: dia. 2 and 3 mm / 14 ga and #4
Welding rate M3 / #4=40 studs/min. (voltage 60 V)
M8 / 5/16"=14 studs/min. (voltage 200 V)
M8 / 5/16“ = 12 studs/min (voltage 220 V)
Capacitance 66,000 μF
Welding time 1 to 3 ms
Energy 1,600 Ws
Charging voltage 50 to 220 V (stepless voltage regulation)
Primary power 230 V/115 V*, 50/60 Hz, 10 AT (slow blow) *alternative primary power see Order Number
Connected load 600 VA
Power source Capacitor
Cooling type F (temperature controlled cooling fan)
IP code IP 21
Dimension L x W x H (without handle) 15.75" x 8.07" x 9.84"
400 x 205 x 250 mm
Weight 30.87 lbs (14 kg)
Suitable guns See below
Order number 92-10-1504B (230 V)
92-12-1504B (115 V)
92-13-1504B (100 V)
WHERE THE CDi 1502 AT FITS
USE CASE WHY THE CDi 1502 AT
Thin sheet metal fabrication CD process avoids blow-through on thin gauges that arc welding can't handle.
Aluminum or brass fastener welding One of the few Sunbelt automation-ready models rated for both materials.
High-cycle production lines Up to 40 studs per minute on M3 fasteners supports fast, repeat-pattern output.
Insulation pin and cupped-head pin attachment Dedicated diameter ranges built into the welding range simplify production.
Portable or bench setups Compact 14 kg unit weight and single-phase 230V/115V power suit smaller workshops and mobile stations.

FAQs

The CDi 1502 AT uses inverter-capacitor charging technology to reduce energy consumption, shorten charging times, and achieve production rates of up to 40 studs per minute, making it suitable for high-volume manufacturing.

Mild steel, stainless steel, and aluminum, across a stud diameter range of M3 to M8 (#4 to 5/16"), plus cupped head pins and insulation pins in smaller diameters.

It uses inverter-capacitor charging instead of a standard transformer charge, cutting energy use by about 30% and giving a 20% energy reserve from its 220V charging voltage, while running about 20% lighter than the previous-generation model.

Yes. The capacitor battery is shock-proof, with no contact between the capacitors and the housing, and a dedicated cooling channel keeps the inverter charging board clean and cool during sustained high-speed cycles.

The PAH-1 tripod gun or PAH-1 centering-device gun, both run with the VBZ-3 fully automatic stud feeder for semi-automatic operation.

14 kg (30.87 lbs), about 20% lighter than the previous-generation CD welder in Sunbelt's line, which makes it easier to move between bench stations.

No. The CDi 1502 AT is a semi-automatic CD stud welder designed for manual gun operation. It supports automated stud loading via the VBZ-3 feeder, but it is not built for full production-line integration.

No. The CDi 1502 AT does not include built-in process monitoring or weld data logging. It offers a digital display and stepless voltage control, but no automated quality-tracking system.

The CDi 1502 AT is an entry-level CD stud welder for semi-automatic use. The gun is operated manually, though stud loading can be automated. The CDMi 2402 is built for higher-level automation and production integration.

Stud Welding Guns

Stud Welding Gun - PAH-1 (Tripod)
PAH-1 (Tripod)
M3 to M8
  • Studs length (from 0.31 to 1.18") - other lengths only by request
  • Universal design for flat surfaces
  • Hand gun for fully automatic stud feed (with VBZ-3) or hand feed
  • Recommended for large-scale production
Stud Welding Gun - PAH-1 (centering device dia. 30 mm)
PAH-1 (centering device dia. 30 mm)
M3 to M8
  • Studs length (from 0.31 to 1.18 inches) - other lengths only by request
  • Used for welding with templates
  • Hand gun for fully automatic stud feed (with VBZ-3) or hand feed
  • Recommended for large-scale production