Hot Plate Welding Machine RFQ Checklist

To request an accurate hot plate welding machine quotation, send the manufacturer your part drawings, exact resin grades, sample parts, weld-joint geometry, product dimensions, output target, required cycle time, quality tests, factory utilities, automation scope, and acceptance criteria. A useful RFQ defines the welded product and the production result—not only the desired machine size. The clearer these inputs are, the easier it is for Jfortune to recommend the motion system, heater, fixtures, controls, safety concept, and validation plan without building costly assumptions into the proposal.

This checklist is written for purchasing managers, manufacturing engineers, project managers, and quality teams evaluating a custom thermoplastic joining system. It can be copied into an RFQ document or used as an agenda for a technical review with Jfortune engineers.

Important: A quotation is an engineering proposal based on the information available at the time. Final settings, cycle performance, weld capability, and acceptance limits must be confirmed with representative parts and an agreed validation plan.

Table of Contents

Hot Plate Welding Machine RFQ Checklist at a Glance

Information to provide	Minimum useful detail	Why it changes the machine proposal
Part files	3D CAD plus dimensioned 2D drawings	Defines tooling access, stroke, heater profile, support, and machine envelope
Plastic material	Full resin designation, supplier, grade, color, fillers, and recycled content	Influences weldability, heater surface, temperature range, and trials
Physical samples	Parts from representative cavities and normal production lots	Reveals warpage, shrinkage, surface condition, and actual fit
Weld-joint data	Joint path, rib dimensions, final assembly height, flash limits, and critical datums	Determines heater geometry, collapse allowance, fixture support, and inspection
Product size and mass	Overall dimensions and mass of each half and welded assembly	Affects loading method, fixture handling, stroke, and frame configuration
Production demand	Annual volume, shifts, parts per cycle, target cycle time, and planned uptime	Helps size the automation level and number of stations
Quality requirements	Leak rate, pressure, strength, appearance, dimensions, and test method	Defines process monitoring and acceptance evidence
Product variants	All part numbers, common features, and changeover frequency	Determines recipe control and quick-change tooling requirements
Factory utilities	Voltage, frequency, compressed air, cooling, extraction, network, and floor limits	Prevents installation and integration surprises
Controls and data	PLC preference, language, recipe permissions, traceability, MES signals, and data retention	Defines the control architecture and interfaces
Safety requirements	Destination market, customer specifications, risk-assessment expectations, guarding, and access	Affects layout, devices, control design, and documentation
Acceptance plan	Samples, run duration, tests, capability evidence, documents, and sign-off roles	Establishes what must be demonstrated before shipment

Why “Please Quote a Hot Plate Welder” Is Not Enough

Two plastic parts may look similar but require very different welding systems. A shallow rectangular reservoir, a long air duct, a cosmetic lamp housing, and a structural pallet can have different loading directions, weld areas, tolerance conditions, forces, heater zones, flash restrictions, and inspection needs. A machine selected only by platen dimensions can fit the part physically and still fail to support the actual process.

The manufacturer must understand three connected subjects:

The component: materials, molded geometry, variation, and handling.
The process result: strength, seal, dimensions, appearance, and repeatability.
The production environment: operators, utilities, automation, data, safety, and maintenance.

When these are defined together, purchasing teams can compare proposals on scope and technical risk rather than on headline price alone.

1. Send Usable Part Data

Start with the product. A neutral 3D format such as STEP is useful for concept development, while dimensioned 2D drawings identify tolerances, datum systems, material callouts, and critical characteristics that may not be obvious in a solid model.

Include the following:

Separate CAD files for both unwelded halves and the final assembly.
Revision level and release status for every file.
Overall dimensions and mass.
Weld-rib profile, joint path, wall thickness, and nominal overlap or collapse allowance.
Critical cosmetic surfaces and areas where flash is not permitted.
Functional datums and dimensions that must be maintained after welding.
Injection-molding gates, parting lines, ejector marks, inserts, ports, and sensitive internal features near the joint.
Proposed loading direction and any surfaces that operators or grippers may contact.
Drawings for all product variants expected to run on the same equipment.

Do not send only a screenshot or finished-assembly image when CAD exists. Images help explain the application, but they cannot reliably define tolerances, tooling clearance, or the volume of material displaced during joining.

Are sample parts required?

Representative samples are strongly recommended before the concept is frozen. CAD shows nominal geometry; molded samples show real flatness, shrinkage, gate influence, texture, contamination, handling marks, and cavity-to-cavity variation. For a multi-cavity mold, label the cavity and lot. Include both normal parts and known boundary samples if the project already has them.

Jfortune should be told whether the samples are prototype, soft-tool, production-tool, or machined parts. A fixture proven with rigid prototypes may behave differently with thin production moldings.

2. Identify the Exact Thermoplastic

“PP,” “PE,” or “ABS” is not a complete material specification. Welding behavior can change with resin grade, molecular characteristics, fillers, reinforcements, pigments, flame retardants, recycled content, moisture, mold-release residue, and lot variation. Our hot plate welding material compatibility guide explains why generic polymer family names are not enough for process selection.

Provide:

Polymer family and complete commercial grade.
Resin manufacturer and technical data sheet, when available.
Filler or reinforcement type and percentage.
Color and color-masterbatch information.
Regrind or recycled-content policy.
Moisture conditioning or drying requirements.
Surface coatings, printing, mold release, or other possible contamination near the joint.
Whether the two halves are the same material or a proposed dissimilar-material combination.

Do not assume that two materials can be welded because their generic names are similar. Dissimilar combinations require review of chemical compatibility, melt behavior, and part requirements. Sample trials may be necessary before Jfortune can recommend a production process.

3. Define the Required Weld, Not Just the Machine

The RFQ should state what a good welded assembly must do. “No leak” is incomplete unless the medium, pressure, method, duration, and acceptance threshold are defined. Likewise, “strong weld” needs a test method and a failure criterion.

Use this quality-definition checklist:

Is the joint structural, liquid-tight, air-tight, cosmetic, or a combination?
What fluid or gas contacts the assembly?
What operating pressure, temperature, vibration, impact, or environmental exposure applies?
Which leak-test method will be used: pressure decay, flow, immersion, vacuum, or another approved method?
Is destructive testing required, such as tensile, peel, burst, impact, torsion, or section analysis?
Which post-weld dimensions are critical?
What flash size, bead appearance, sink, marking, or deformation is acceptable?
Are there protected internal passages where displaced material cannot enter?
What inspection frequency and traceability are required in production?
Who supplies the test fixture, master samples, gauges, and test specification?

When a requirement is not yet known, label it as open rather than entering an arbitrary value. Jfortune can then identify it as a project decision and propose a feasibility or development step.

4. Quantify the Production Requirement

Annual volume alone does not determine automation. Tell the supplier how production is expected to run.

Production question	Example of a useful answer
How many good assemblies are required?	State per year, per month, and per shift
How many shifts and days will the line run?	Include planned breaks and changeovers
What is the target cycle time?	Clarify whether it includes manual loading, leak testing, labeling, and unloading
How many parts should be welded per cycle?	One assembly, paired cavities, or multiple nests
How many product variants are included?	List part numbers and forecast mix
How often will tooling change?	Per shift, weekly, seasonal, or infrequent
Who loads and unloads?	Operator, robot, gantry, conveyor, or upstream machine
What is the future expansion plan?	Additional variants, automation, test station, or capacity

A very short requested cycle should be discussed in terms of the complete production sequence. Heating and cooling depend on the material, wall section, joint geometry, and quality requirement. Faster heater travel does not automatically make the polymer heat or solidify faster. The quotation should clearly identify which portions of the cycle are estimated and which have been demonstrated.

5. Describe the Preferred Machine and Tooling Scope

If the customer has an established preference for servo, hydraulic, or pneumatic motion, include the reason. However, allow the manufacturer to compare that preference with the part and process needs. The hot plate welding machine types and specifications page provides a useful starting point before the detailed RFQ review.

Questions to answer include:

Is programmable position, speed, or collapse control required?
What joining force range is expected, and how was it estimated?
Is the preferred orientation vertical, horizontal, or open for engineering review?
Are one or both part fixtures required to move independently?
Does the heater require multiple temperature-control zones?
Should the process use contact heating, or should non-contact hot-plate heating be evaluated?
Must tooling be changed from the front, side, rear, or with a trolley?
Are part-presence, orientation, code-reading, or cavity-identification sensors required?
Does the project include an integrated leak tester, camera, marker, labeler, robot, or conveyor?
Who owns the cold fixtures, hot tool, test tooling, gauges, and change parts?

Tooling should be treated as part of the welding system, not as an accessory. It must locate the molded halves, support the weld perimeter, resist joining loads, protect appearance surfaces, allow heater clearance, and remain serviceable. If the molded part is flexible or warped, the RFQ should identify the permitted restraint strategy rather than expecting the machine to force an unstable part into an undefined condition.

6. Provide Site Utilities and Integration Standards

Export equipment projects often lose time because site conditions are discussed after design. Include the destination country and installation site as early as possible.

Confirm:

Available voltage, phase, frequency, and permitted electrical load.
Compressed-air pressure, quality, and available flow.
Cooling-water or chiller conditions, if required by the proposed system.
Exhaust or ventilation requirements defined by the customer’s risk assessment.
Ambient temperature, humidity, dust, and cleanliness expectations.
Floor space, ceiling height, access doors, freight elevators, and floor-loading limits.
Preferred operator side and material-flow direction.
Network standard and approved industrial communication protocols.
Upstream and downstream handshake signals.
Customer-approved component brands or prohibited components.
Interface language, units, and documentation language.

State the destination market, intended use, applicable regulations and customer specifications, required documentation, and responsibility boundaries. “CE required” is not a complete machine-safety specification; the final conformity scope must follow the applicable legislation and a project-specific risk assessment.

7. Define Controls, Recipes, and Production Data

A machine that can make a good sample is not automatically ready for controlled production. The RFQ should describe how settings will be protected, how faults will be diagnosed, and what records are needed.

Consider:

Number of recipes and permitted user roles.
Password or authorization levels for operators, engineers, maintenance, and administrators.
Parameters to display and record, such as heater-zone temperature, time, motion position, force, displacement, and cycle result where supported by the final design.
Alarm history and maintenance records.
Part identification and recipe verification.
Data export format and retention period.
Connection to MES, line PLC, barcode scanner, or plant network.
Good-part, reject, bypass, and rework logic.
Time synchronization and batch or serial-number requirements.
Remote-support policy approved by the customer’s information-security team.

Ask for data that supports a real quality decision. Collecting every available value without defined limits, review responsibility, or reaction plan can create complexity without improving the process.

8. Agree on FAT, Delivery, Installation, and Training

An acceptance plan protects both buyer and manufacturer. It should state what will be tested, which parts and material will be used, how results will be measured, and who can approve open items. The Jfortune factory acceptance and delivery inspection guide shows how these requirements connect to the pre-shipment review.

Factory acceptance information to include

Approved machine and tooling scope.
Quantity and condition of customer-supplied parts.
Material lots and cavity identification.
Agreed parameter set and controlled user access.
Safety-function checks based on the approved plan.
Sample-weld quantity and run sequence.
Cycle-time measurement boundary.
Visual, dimensional, leak, and destructive tests.
Changeover demonstration, if multiple tools are supplied.
Alarm recovery and controlled restart checks.
Documentation and spare-parts review.
Punch-list process and responsibility for closure.

Also state the expected Incoterm, packing requirement, destination, unloading responsibility, installation scope, site-acceptance plan, training audience, and requested language. If customer material or samples arrive late, define how that affects trial timing and acceptance.

Copy-Ready RFQ Template

Use the following block when contacting Jfortune:

Company and project

Company, plant location, and project contact:
Product name and application:
Planned production start:
Confidentiality or data-transfer requirement:

Part and material

CAD and drawing revision:
Dimensions and mass of each half:
Exact resin grade, filler, color, and recycled content:
Number of mold cavities and available samples:
Joint function and weld-rib details:
Critical appearance and dimensional requirements:

Production

Annual volume and shift pattern:
Target cycle time and measurement boundary:
Parts per cycle:
Product variants and changeover frequency:
Manual or automated loading:

Quality

Leak, strength, dimensional, and appearance criteria:
Test methods and test equipment responsibility:
Required process records and traceability:
FAT and SAT expectations:

Factory and integration

Power supply and compressed air:
Available floor space and loading direction:
PLC, HMI, network, and component preferences:
Upstream and downstream interfaces:
Customer safety and documentation specifications:

Commercial scope

Required tooling, gauges, test station, automation, spare parts, training, installation, and packing:
Delivery destination and requested commercial terms:

How to Compare Supplier Quotations

Normalize the scope before comparing price. One supplier may include custom hot tooling, cold fixtures, sample trials, process data, guarding, training, and export packing, while another may quote only a basic press and heater.

Score each proposal against these questions:

Does the concept reference the correct drawing and resin revision?
Does it explain how the joint will be heated, supported, aligned, and cooled?
Are assumptions and open technical points visible?
Are machine, tooling, automation, inspection, and documentation boundaries clear?
Is cycle time identified as estimated or validated?
Are acceptance tests connected to the customer’s actual quality requirements?
Can operators change only the parameters they are authorized to change?
Is maintenance access considered in the layout?
Are installation, training, spare parts, and support responsibilities defined?
Does the proposed schedule include customer drawing approval, sample availability, trials, FAT, and punch-list closure?

The lowest initial price is not necessarily the lowest project cost. Unclear tooling scope, missing test equipment, unsuitable utilities, or an undefined acceptance method can become expensive changes later.

Common RFQ Mistakes to Avoid

Requesting a machine before the product revision is stable.
Sending generic polymer names instead of exact resin grades.
Hiding mold variation or supplying only the best-looking samples.
Defining cycle time without loading, cooling, inspection, or unloading boundaries.
Asking for a leak-proof weld without a measurable leak-test method.
Selecting a drive technology only because it appeared in another supplier’s quotation.
Forgetting product variants and future changeovers.
Treating fixtures and the heater as separate from process capability.
Assuming all destination-market and customer safety expectations are identical.
Leaving FAT criteria until the machine is already complete.

Frequently Asked Questions

What files should I send for a hot plate welding machine quotation?

Send separate 3D CAD files for both parts and the welded assembly, dimensioned 2D drawings, resin specifications, product photos, available quality standards, and a list of variants. Include the correct revision status. Representative molded samples are strongly recommended.

Can Jfortune quote without physical samples?

A preliminary concept may be possible from complete CAD and material information, but samples reduce uncertainty. Final tooling details and process expectations should be confirmed with representative molded parts whenever practical.

How is the machine size selected?

The envelope depends on part dimensions, fixture construction, heater travel, opening clearance, loading access, stroke, and maintenance space. The joining system also depends on weld area, material behavior, support, required motion, and quality controls. Platen length alone is not enough.

What affects the price of a custom hot plate welding machine?

Major scope drivers include machine architecture, number of controlled axes, heater size and zoning, custom fixtures, product variants, quick change, guarding, controls, data integration, automated handling, inspection equipment, documentation, trials, installation, and training. A detailed RFQ allows these items to be priced transparently.

Can a supplier guarantee cycle time before sample trials?

The supplier can make an engineering estimate, but heating and cooling depend on the actual resin, geometry, wall thickness, molded condition, and acceptance requirement. The proposal should distinguish estimates from results demonstrated with representative parts.

What should be agreed before placing the order?

Agree on the drawing and material revision, complete supply scope, responsibility matrix, utilities, safety and control requirements, sample availability, quality tests, acceptance method, documentation, training, shipping, and change-control process. Record assumptions and open items in the technical agreement.

Request a Jfortune Application Review

Jfortune designs each hot plate welding system around the customer’s parts, tooling, process requirements, and production plan. Send the application data in this checklist through our engineering contact page. We can review the weld concept, identify open technical questions, and define the next step toward a custom hot plate welding machine proposal.

Hot Plate Welding Machine RFQ Checklist: What to Send Your Manufacturer