ame: Space Engineers 2
Mode: Survival
Reproducible: Yes (intermittent but consistent under certain conditions)
Summary:
Welding stops functioning when either the player inventory or the grid inventory is full. The welder produces sparks but does not apply components or progress the block. Dropping ore or freeing inventory space immediately restores welding functionality. This behavior is not documented and did not occur in earlier builds.
Steps to Reproduce:
Fill the player’s backpack to maximum capacity (especially with silicon or mixed ores).
Fill the grid’s cargo containers or approach near‑full capacity.
Attempt to weld any block using the hand welder or area welder.
Observe that sparks appear, but no welding progress occurs.
Drop any ore (iron works reliably) to free one inventory slot.
Attempt welding again — welding now works normally.
Expected Behavior:
Welding should apply components directly to the block even when inventory is full, or the game should provide a warning message explaining that welding requires free inventory space.
Actual Behavior:
Welding silently fails with no error message. Sparks appear, but no components are applied and no progress is made. Freeing inventory space immediately resolves the issue.
Additional Notes:
Issue appears related to the welder’s internal “staging buffer” failing when inventory is full.
Silicon ore seems more likely to trigger the issue, possibly due to stacking behavior.
The issue can also occur after switching welders or carrying both welders, but inventory fullness appears to be the root cause.
Reloading the save also resolves the issue temporarily.
System:
Survival, single‑player, standard settings.
I have the same bug 
Your backpack is full, you cannot weld/build items automatically when there is no space left.
It has been reported multiple time before.
Your backpack is full, you cannot weld/build items automatically when there is no space left.
It has been reported multiple time before.
Thanks so much!
Thanks so much!
Hello Engineers,
It seems that if the Character's inventory is at 100%, Hand Welder will not work in Raw Mode, however, welding using components should still be possible. Additionally I could not reproduce this using Grids as Welder Blocks work exclusively in Component Mode.
I have reported the issue with Hand Welder and attached this thread to our internal ticket (SE2-32517).
Kind Regards,
Bartosz
Keen Software House
Hello Engineers,
It seems that if the Character's inventory is at 100%, Hand Welder will not work in Raw Mode, however, welding using components should still be possible. Additionally I could not reproduce this using Grids as Welder Blocks work exclusively in Component Mode.
I have reported the issue with Hand Welder and attached this thread to our internal ticket (SE2-32517).
Kind Regards,
Bartosz
Keen Software House
I also tested in another world shared by a Participant on the Setam SE2 Forum, and it is the same Bug.
I can't build projected blocks with normal character hand welder when my character inventory is full load with red warning blinking in lower left corner of the screen.
I also tested in another world shared by a Participant on the Setam SE2 Forum, and it is the same Bug.
I can't build projected blocks with normal character hand welder when my character inventory is full load with red warning blinking in lower left corner of the screen.
Test in this Workshop save shared by another Participant :
Steam Workshop::cant build
Test in this Workshop save shared by another Participant :
Steam Workshop::cant build
The problem, I think, is linked to welding from Ore, where the game wants to push the item in your backpack before using it like a normal welding.
This does not make logical sense to me. If I were, here, to create something with the need to use it right away, I would not store it before using it, I would use it right away.
The ore welding will have to piggy back a bit later in the standard welding method 😉
The problem, I think, is linked to welding from Ore, where the game wants to push the item in your backpack before using it like a normal welding.
This does not make logical sense to me. If I were, here, to create something with the need to use it right away, I would not store it before using it, I would use it right away.
The ore welding will have to piggy back a bit later in the standard welding method 😉
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